Key Laboratory of Agro Environment in the Tropics

Guangzhou, China

Key Laboratory of Agro Environment in the Tropics

Guangzhou, China
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Wei H.,South China Agricultural University | Wei H.,Key Laboratory of Agro Environment in the Tropics | Wei H.,Guangdong Engineering Research Center for Modern Eco agriculture and Circular Agriculture | Xu J.,South China Agricultural University | And 7 more authors.
Archives of Agronomy and Soil Science | Year: 2017

Soil organic carbon (SOC) consists of various classes of organic substances that can be pooled as labile and non-labile fractions. Previous studies have suggested that plant invasion increases SOC content, but whether invasion consistently alters SOC fractions remains unclear. Consequently, the present study was conducted to observe the effects of Praxelis clematidea invasion on SOC fractions in a tropical savanna of southern China. Soil samples were collected in two surface soil layers (0–10 and 10–20 cm) from non-, slightly and severely invaded plots to analyse the total SOC, readily oxidizable SOC (ROC), and non-readily oxidizable SOC (NROC) content. The results showed that severe P. clematidea invasion significantly increased the SOC content by 47% in the surface soil (p < 0.001). The increase in SOC content largely originated from the accumulation of NROC (the non-labile fraction), rather than ROC which typically is regarded as the labile OC fraction. This change may be beneficial to long-term soil C stabilization because chemical recalcitrance is an important pathway to prevent SOC from decomposition. Although the mechanisms for NROC accumulation have not been thoroughly elucidated to date, our results suggest that P. clematidea invasion may facilitate soil C sequestration in this tropical savanna. © 2017 Informa UK Limited, trading as Taylor & Francis Group


Wei H.,South China Agricultural University | Wei H.,Key Laboratory of Agro Environment in the Tropics | Wei H.,Guangdong Engineering Research Center for Modern Eco agriculture and Circular Agriculture | Xu J.,South China Agricultural University | And 7 more authors.
Ecosphere | Year: 2017

The ecological impacts of biological invasion are generalized with difficulty since these impacts are commonly species- or ecosystem-specific. A noxious invasive plant, Chromolaena odorata, has invaded broad regions, but limited attention has been paid to clarify the ecological impacts of this invasive plant on soil carbon (C) and nitrogen (N) storage in invaded ecosystems. This study was conducted to investigate changes in the labile and total soil C and N fractions in the surface and subsurface soil layers in non-invaded plots, plots with slight (30%) or severe (100%) invasion, and a restored forest plot with native tree and shrub species within a tropical savanna. Our results showed that different severities of C. odorata invasion induced inconsistent responses of the soil C and N fractions in the investigated tropical savanna. In particular, slight invasion did not alter or decreased the total and labile soil C and N fractions, and severe invasion significantly increased most of the total and labile soil C and N fractions. The encroachment of woody species significantly increased the soil C and N contents, with significantly higher increases than in the invaded plots. Our results suggest that the impacts of invasion on soil C and N fractions could vary depending on invasion severity. Therefore, comparisons of the invaded and non-invaded plots with invasion duration or severity overlooked are likely to result in biased conclusions regarding the invasioninduced ecological consequences in terrestrial ecosystems. Moreover, C. odorata invasion can alter soil nutrient conditions according to the needs of C. odorata establishment at different stages and consequently affect the soil C and N contents in this tropical ecosystem. © 2017 Wei et al.


Yang H.,South China Agricultural University | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Environment in the Tropics | Deng Z.,South China Agricultural University | And 6 more authors.
Mitochondrial DNA Part B: Resources | Year: 2016

We present the complete mitochondrial genome of Cipangopaludina cathayensis in this study. The mitochondrial genome is 15 706 bp in length, containing 13 protein-coding genes, two rRNA genes and 22 tRNA genes. Overall nucleotide compositions of the light strand are 40.97% of A, 30.78% of T, 20.48% of C and 12.60% of G. Its gene arrangement and distribution are different from the typical vertebrates. The absence of D-loop is consistent with the Gastropoda, but, at least, one lengthy non-coding region is an essential regulatory element for the initiation of transcription and replication. A phylogenetic tree is constructed using the maximum-likelihood method based on the complete mitogenomes of the closely related 21 Gastropoda species to assess their actual phylogenetic relationship and evolution. The result provides fundamental data for resolving phylogenetic and genetic problems related to effective management strategies. © 2016 The Author(s). Published by Taylor & Francis.


Guo J.,South China Agricultural University | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Environment in the Tropics | Zhao B.,South China Agricultural University | And 4 more authors.
Biocontrol Science and Technology | Year: 2016

The golden apple snail Pomacea canaliculata is invasive in South China and poses serious harm to agricultural production and aquatic ecosystems. In the present study, we investigated the predatory potential of the spotted green pufferfish Tetraodon nigroviridis (50 mm in body length) on snails of various sizes in fresh and brackish water (4.5 ppt salinity). The survival and damage rates of 50 snails were estimated at 1, 3, 5 and 7 days. The survival rate of snails, including 10 adult snails (20–35 mm shell height), decreased less than 25% in the presence of pufferfish, and this decrease was more profound in brackish than in fresh water. Approximately 98% of the snails died in brackish water in the presence of only four pufferfish. The pufferfish also inflicted a high rate of snail injury resulting from attacks involving bites. In addition, the pufferfish affected the behaviour of the snails, with more than 95% of snails exhibiting tightly closed opercula. Thus, the results of this study suggest that pufferfish are effective for the biological control of golden apple snails. © 2016 Informa UK Limited, trading as Taylor & Francis Group.


Guo J.,South China Agricultural University | Xu W.-B.,South China Agricultural University | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Environment in the Tropics | And 7 more authors.
Chinese Journal of Applied Ecology | Year: 2014

In order to understand whether Pomacea canaliculata exhibits gender differences in cold resistance, the survival rate and supercooling point of both P. canaliculata females and males were investigated at low temperature. The changes in physiological and biochemical indices in the body of P. canaliculata before and after the winter were also examined. The results showed that the mean supercooling point of females was -6.83°C, which was significantly lower than that of the males (-6.26°C). With the arrival of winter, the amounts of bound water, glycerol, lipid and glycogen of P. canaliculata increased, while the amount of free water decreased. These indices except glycerol showed significant differences between males and females. More than 90% non-acclimated snails could survive at the temperature of 10°C for 7 days. The survival rate of snails exhibited significant differences in sex and shell height after being transferred at 5°C for 7 days. In addition, more females were recorded during field investigation. Based on these results, we concluded that the females had higher cold tolerance than the males. This finding would provide some references for further investigation of ecological adaptation, natural sex ratio and cold tolerance mechanisms of P. canaliculata.


Ye Y.,South China Agricultural University | Ye Y.,Key Laboratory of Agro Environment in the Tropics | Zhang J.E.,South China Agricultural University | Zhang J.E.,Key Laboratory of Agro Environment in the Tropics | And 3 more authors.
Applied Ecology and Environmental Research | Year: 2015

This study analyzed the landscape pattern changes, the dynamics of the ecosystem service values (ESVs) and the spatial distribution of ESVs from 1995 to 2005 in Guangzhou, which is the capital of Guangdong Province and a regional central city in South China. Remote sensing data and geographic information system techniques, in conjunction with spatial metrics, were used to facilitate the analysis. The forest was the main landscape with a total coverage of 37.36% during the study period. Between 1995 and 2005, the forest and garden became less fragmented while the cultivated land, grassland, water body and built-up area became more fragmented. Such landscape pattern changes have resulted in a significant increase in the overall annual ESVs in Guangzhou of approximately 3.37%. Two important landscape types (forest and water body) were the main contributor to the total ESVs, the proportion of both of which was over 75%. During the period from 1995 to 2005, the ESVs tended to decline from the north and south to the central part in Guangzhou. The average ESVs was more than 15 000 Yuan/ha in the north for the mountainous forest area and 20 000 Yuan/ha in the south for the water body at the Pearl River mouth, but the average ESVs was lower than 5 000 Yuan/ha in the central part of the study area due to low vegetation coverage and widely scattered built-up area for rapid urbanization. So, it is important to protect the key landscape types, such as forest, water body and garden, to avoid fragmentation. Furthermore, this study offers important insights to those in fast-urbanizing regions for achieving more successful landscape to obtain the increasing of ESVs. © 2015, ALÖKI Kft., Budapest, Hungary.


Ye Y.-Q.,Key Laboratory of Agro Environment in the Tropics | Ye Y.-Q.,Guangdong Engineering Research Center for Modern Eco agriculture and Circular Agriculture | Ye Y.-Q.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Environment in the Tropics | And 6 more authors.
Chinese Journal of Applied Ecology | Year: 2016

From the land use vector data of Guangzhou-Foshan Metropolitan Area (GFMA) in 1990, 1995, 2000, 2005 and 2010, four types of agriculture and forestry ecosystem (cropland, forestland, garden and water body) were extracted. Then, we evaluated the GFMA's agriculture and forestry ecosystem services value (AESV) based on Costanza's method after adjusting the 'ecosystem services value per unit area of China's terrestrial ecosystem' raised by Xie Gaodi through regional, functional and economic factor adjustment. The results showed that the total AESV had a wavelike upward trend due to the continuous development of economy and the increase of people's living standards in GFMA. The AESV in GFMA was 413.74×108, 612.83×108, 582.88×108, 773.44×108 and 698.67×108 yuan in 1990, 1995, 2000, 2005 and 2010, respectively. During the studied period, water body's service value grew fastest, which was 166.74×108 yuan, and followed by forestland and garden amounting to 103.01×108 and 47.74×108 yuan, respectively, while the cropland's service value decreased by 32.56×108 yuan and the decreasing rate was 23.1%. According to the spatial distribution, the AESV tended to decline from the northeast and the southwest to the central part in GFMA from 1990 to 2010. The proportion of individual service value to the total services value changed little, and the contribution of individual service value decreased in the order of water supply, waste treatment, biodiversity protection, climate regulation, soil formation and protection, gas regulation, recreation and culture, raw material and food production. © 2016, Science Press. All right reserved.


Ye Y.,Key Laboratory of Agro Environment in the Tropics | Ye Y.,Key Laboratory of Agro ecology and Rural Environment of Guangdong Regular Higher Education Ins | Zhang J.,Key Laboratory of Agro Environment in the Tropics | Zhang J.,Key Laboratory of Agro ecology and Rural Environment of Guangdong Regular Higher Education Ins | And 4 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2012

Evaluation of ecosystem service has been one of the hottest issues in the field of ecology and ecological economics since the publication of Costanza's famous article in Nature in 1997. Agricultural ecosystem (farmland and orchard) is a semi-natural and semi-manipulated ecosystem, which not only provides people with grains, vegetables, and fiber, but also plays an important role in ecological buffers, regulation for gas regulation, soil and water conservation, and environmental decontamination. However, agricultural ecosystem also has negative effects on our environment, such as excessive water resource consumption, greenhouse gas emission, and environmental pollution caused by fertilizer and pesticide application. Agricultural ecosystem service has profound effects on the sustainable development of human society, and its study is one of the research frontiers in ecology. However, there are only a few research reports on the agricultural ecosystem services in China, especially in the rapid urbanized areas. This paper, based on the connotation of ecosystem service, developed an evaluation index system for assessing the agricultural ecosystem services value in Foshan City in Guangdong Province and quantified the positive benefits and negative benefits of agricultural ecosystem services in Foshan City during the period of 2000-2009, which locates in the Pearl River Delta (PRD), one of the most powerful economic areas in China and covers 5 districts with Chancheng, Nanhai, Shunde, Sanshui and Gaoming. The results showed that the total service value of agricultural ecosystem in Foshan increased from Υ5. 88×109 in 2000 to Υ7. 31×109 in 2009 and a net increase of Υ1. 43×109 was achieved during this decade. The products provision service, which was one of the most important services of agricultural ecosystem in Foshan, was significantly affected by technology and management and there is a potential for its further improvement in this region. The proportion of its products provision value to the positive benefits increased from 30. 47% in 2000 to 61. 15% in 2009 while its proporation to the total value increased from 36. 86% in 2000 to 69. 33% in 2009, indicating that the other services were being gradually weakened except for the products provision. For the period of study, the positive benefits of agricultural ecosystem were greater than the negative benefits while the gap between them was widening each year, and the ratio of positive benefits to negative benefits increased from 5. 77:1 in 2000 to 8. 48:1 in 2009. Water resource consumption and greenhouse gas emission were the most serious problems of agricultural ecosystem services in Foshan City and the combined proportion of these two components in the total environmental costs value was 82. 79% in 2000 and 78. 40% in 2009, indicating an urgency to take effective measures to decrease the irrigation water consumption and to change the farming system in the region in order to minimize those adverse impacts on the agricultural environment. The current study demonstrated that agricultural ecosystem services have both positive and negative benefits apart from providing agricultural products. To attain sustainable development of the nature, economy and society ecosystem in fast urbanized areas, evaluation of agricultural ecosystem service should be imperative.


Liang K.-M.,South China Agricultural University | Liang K.-M.,Key Laboratory of Agro Environment in the Tropics | Zhang J.-E.,South China Agricultural University | Zhang J.-E.,Key Laboratory of Agro Environment in the Tropics | And 7 more authors.
Chinese Journal of Ecology | Year: 2013

A laboratory experiment was conducted to study the effects of mechanical stimulation on the physiological characters of rice plant. Mechanical stimulation decreased the permeability of rice leaf plasma membrane, but, with the increase of stimulation intensity and treatment time, the permeability presented an increasing trend. The leaf chlorophyll a (Chl-a) content was increased by mechanical stimulation treatments, while the leaf chlorophyll b (Chl-b) content presented a decreasing trend. Low intensity mechanical stimulation increased the activities of protective enzymes peroxidase (POD), superoxide dismutase (SOD), and polyphenol oxidase (PPO) in rice leaves. In mechanical stimulation treatments, the leaf 3-indoleacetic acid (IAA) content was reduced with time, whereas the leaf abscisic acid (ABA) content and the root activity showed an opposite trend. These results indicated that mechanical stimulation could be one of the important reasons leading to the morphological and physiological variations of rice plant. The findings from this study could provide a theoretical basis to further study the effects and action mechanisms of mechanical stimulation on the rice plant growth in rice-duck farming system.


Zhao B.,South China Agricultural University | Zhao B.,Key Laboratory of Agro Environment in the Tropics | Zhang J.,South China Agricultural University | Zhang J.,Key Laboratory of Agro Environment in the Tropics | And 4 more authors.
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2014

Pomacea canaliculata (Lamarck) is an invasive aquatic gastropod endangering rice production in Southern China, with a feeding preference for rice seedlings in paddy fields. P. canaliculata is listed as one of the top 100 invasive species by the Invasive Species Group of the World Conservation Union. P. canaliculata mainly feeds on a diverse range of macrophyte species. We investigated the invasive effects of P. canaliculata on the aquatic macrophyte plant community in paddy fields. Our experimental macrophyte community consisted of Oryza sativa L., Pistia stratiotes L., Eichhornia crassipes, Myriophyllum aquaticum, Alternanthera philoxeroides, Monochoria vaginalis. The control and three treatments used different P. canaliculata densities: control (P. canaliculata-free); low (4 individuals/ m2); medium (8 individuals/m2) and high (12 individuals/ m2). We analyzed the effect that P. canaliculata had on the macrophyte community using the compound food preference test. Our results showed: 1) O. sativa densities in the three treatments decreased rapidly one week after P. canaliculata was introduced. In herbivore, in the P. canaliculata high-density treatment, O. sativa density declined approximately 70%. However, two weeks after P. canaliculata was introduced, the herbivore effect on O. sativa density decreased. 2) After eight weeks P. canaliculata reduced A. philoxeroides and M. vaginalis densities (30% and 25%, respectively) in the high-density herbivore treatment and inhibited the growth of A. philoxeroides and M. vaginalis. The plant densities of A. philoxeroides and M. vaginalis were higher in the low-density herbivore treatment compared with those in the medium and high-density herbivore treatments. However, P. canaliculata showed no significant effect on the plant densities of E. crassipes, P. stratiotes and M. aquaticum. 3) The daily density rate of increase was negative for O. sativa, and significantly different in the low, medium and high-density herbivore treatments. The daily density rate of increase for O. sativa showed a significant decrease compared with the P. canaliculata-free control. The daily density rate of increase for A. philoxeroides and M. vaginalis was positive, where the rate was significantly lower compared with the P. canaliculata-free control. Concurrently, the daily density rates of increase were not significantly influenced by P. canaliculata for P. stratiotes, E. crassipes and M. aquaticum. We found that P. canaliculata populations increased rapidly. The daily density rate of increase for P. canaliculata populations in the three different density treatments were all high, but not significantly different. The food preference frequencies of P. canaliculata on O. sativa, A. philoxeroides and M. vaginalis were all significantly higher compared with E. crassipes, P. stratiotes and M. aquaticum. 4) Eight weeks after the introduction of P. canaliculata the Simpson, Shannon and Homogeneity biodiversity indices showed a significant decline in the aquatic macrophyte community. The Simpson index values showed the decline in order of: the control > low-> medium-and high-densities. The Shannon and Homogeneity indices showed the decline in order of: the control > low-> medium-> high-densities. We conclude that P. canaliculata showed significantly different feeding preference on macrophyte plants species. The invasion of P. canaliculata would significantly endanger aquatic macrophyte community biodiversity in the paddy fields of China.

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