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Wang C.,Chinese Academy of Forestry | Yu M.-K.,Chinese Academy of Forestry | Zhang C.,Chinese Academy of Forestry | Wu T.-G.,Chinese Academy of Forestry | And 2 more authors.
Forest Research | Year: 2010

The leaf chlorophyll contents, the daily dynamic of net photosynthetic rate (Pn ), stomatal conductance (Gs), intercellular CO 2 concentration ( Ci) and major affecting factors were determined of three clones of Catalpa bungei under salt stress. The results showed that Chla, Chlb and Chit contents decreased under salt stress and significant differences were found of Chla, Chlb and Chit among 3 clones of C. bungei. The ratios of Chla/Chlb increased with the increasing of salt concentration, and significant differences were found in different treatments of 02-2-5 and 07-1.The maximum of Pn(Pmax) appeared at 8:00 in all treatments of 3 clones, with the sequence of 02-2-5 > YQ1 >07-1, and significant differences were found in 3 clones. Pn was also decreased with the increasing of salt concentration, and the sequence of decrement was 07-1 > YQ1 > 02-2-5. Stepwise multiple-regression and path coefficient analysis indicated that the major affecting factor of Pn were Ci, leaf temperature (T1) and photosynthetic active radiation (PAR) in clones of 02-2-5 and YQ1, but Gs,and Ci in 07-1. Based on the variations of leaf chlorophyll contents and Pn among 3 clones under salt stress, 02-2-5 had the highest salt tolerance, followed by YQ1, and 07-1. Source


Kong W.-J.,Chinese Academy of Forestry | Zhou B.-Z.,Chinese Academy of Forestry | An Y.-F.,Chinese Academy of Forestry | Wang G.,Chinese Academy of Forestry | And 2 more authors.
Forest Research | Year: 2010

The eco-hydrological effects of bamboo plantation in Miaoshanwu Nature Reserve, Zhejiang Province, were observed and studied from March to October of 2009 at the level of stand and runoff plot. The results showed that: (1) The total precipitation during the observation period was 1 220.8 mm, the through-fall, stem-flow and canopy interception contributed to 78.2% , 7.3%, and 14.5% of total precipitation, respectively. With the precipitation increasing, the through-fall and stem-flow increased linearly, while the canopy interception increased abruptly at the beginning till the precipitation reached about 10 mm when the canopy interception steadily varied from 5mm to 6 mm; (2) The litterfall on forest floor was 4.37 t · hm-2 . The maximum water retention ratio and water-holding capacity of litter were 223% and 0.975 mm; (3) The surface runoff of plot was low and only 2.41 mm, accounting for 0.20% of the total precipitation. The total sediment was 126. 3 kg · hm-2 , implying a soil erosion of 1.034 kg · hm · mm-1 . It is concluded that the function of soil and water conservation of bamboo plantation on the plot is pretty good. Source


Guo Z.W.,Chinese Academy of Forestry | Yu W.X.,Forestry Bureau of Fuyang City | Chen S.L.,Chinese Academy of Forestry | Li Y.C.,Chinese Academy of Forestry | Yang Q.P.,Chinese Academy of Forestry
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2013

Soil microbe is the major component of soil throghout the whole process of soil development, and plays a key role in material recycling and energy conversion in soil ecosystem.The living environment for soil microbe is a very sensitive early?warning indicator of changes in soil ecosystem.To approach the impact of intensive and mulching management on soil microbial biomass populations and biomass and to clarify the degradation mechanism of Phyllostachys praecox stand, the test plot was established.With the experiment, microbial composition, microbial biomass carbon (Cmic), microbial biomass nitrogen(Nmic), microbial biomass phosphorus (Pmic) from bamboo stand with different mulching management treatments (6a, 3a, 1a and CK stand) were determined, meanwhile the relationship between soil microbe and soil organic matter (SOM), total nitrogen(TN), total phosphorus(TP), total potassium(TK), available nitrogen(AN), available phosphorus (AP), available potassium(AK) and pH was analyzed, too, and this research will provide theoretical guidance for regeneration of degraded bamboo plantations. The results showed that: (1) Among the microble in Ph.praeox stand soil, bacteria was the dominant, fungi was the next and actinomycete was the least, and accounted for 90.11%-98.03%, 1.04%-9.22% and 0.67%-1.37% of total number for soil microble, respectively.With the time of mulching management extending, the percentage of soil bacteria and actinomycete descended, while the percentage of fungi ascended.Moreover, the quantity of microbe, bacteria, actinomycete, and Cmic, Nmic, Pmic increased firstly then fell, and the difference among all treatments were highly significant, while the number of fungi increased significantly.(2) There were highly significant or significant correlation between soil microbial factors and SOM, TN, TP, AN and pH, and the correlation among soil nutrients and soil microbial factors were positive for CK, 1a and 3a stands, while that was negative for 6a stand.(3) There were different restrictive relationship between soil microbe factors and soil nutrient for CK, 1a, 3a and 6a stand.In the CK stand, SOM, TN, pH, AN and AK played a greater role and mainly affected on Cmic, Nmic and bacteria.While for the 1a stand, SOM, TN, TP and AK had a greater effect on soil Pmic, actinomycete and bacteria.And in the 3a stand, SOM, TN, AP and AN mainly influenced soil Nmic, actinomycete and fungi.Moreover for the 6a stand, SOM, TN and pH proudly affected on soil Nmic and fungi. It could be concluded that based on the results soil obstacle caused by inhibition of actinomycete and bacteria, in addition to promotion of fungi, and changed restrictive relationship between soil microbial factors and soil nutrients were main cause leading to soil degradation for mulching bamboo stand. Source


Zhao Z.-X.,Chinese Academy of Forestry | Li Z.-C.,Chinese Academy of Forestry | Zhou J.-G.,Forestry Bureau of Fuyang City | Cheng C.-F.,Chinese Academy of Forestry | And 2 more authors.
Chinese Journal of Ecology | Year: 2016

A study was conducted to analyze the soil organic carbon and soil nutrient content changes of natural Pinus massoniana forest in the depth of 0-50 cm in north subtropical area of China one year after burning. The results showed that the contents of soil total organic carbon (TOC) , easily-oxidized carbon (EOC) and light fraction organic carbon (LFOM) in the burned plots were higher than those in the unburned plots, with respective increases of 4.5%-47.6%, 6.6%-43.0% and 9.0%-49.1% and significant differences in the depths of 0-10 cm and 10-20 cm (P<0.01). Compared with the unburned plots, the soil carbon storage in the depth of 0-50 cm was increased by 23.8% after forest fire. TOC, EOC and LFOM were all significantly correlated to soil nutrients (total N, hydrolysis N, and available K) after forest fire. The main reason for the increased soil organic carbon could be due to the input of organic residues from vegetation layer. © 2016, editorial Board of Chinese Journal of Ecology. All rights Reserved. Source

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