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Urunchi, China

Huang J.-H.,Chinese Academy of Forestry | Lu X.-H.,Chinese Academy of Forestry | Guo Z.-J.,Xinjiang Forestry Academy | Zang R.-G.,Chinese Academy of Forestry
Beijing Linye Daxue Xuebao/Journal of Beijing Forestry University | Year: 2015

We evaluated the value of natural forest ecosystem services, based on seven ecological services (ten indices) of water conservation, soil conservation and fertility maintenance, CO2 fixation and O2 generation, nutriment accumulation, air purification, biodiversity protection, and forest recreation, with the use of Type I inventory data of natural forests in Buerjin County of Xinjiang in 2001, 2006, and 2011. Results showed that the average area of natural forests is 77047.98 ha with 72927.76 ha in 2001, 77872.02 ha in 2006, and 82816.27 ha in 2011. The average volume of natural forests was 17.5113 million m3, 16.7555 million m3 in 2001, 17.6276 million m3 in 2006 and 18.1507 million m3 in 2011. The average annual value of natural forest ecosystem services in Buerjin County was 5.034 billion RMB from an estimate of 4.180 billion in 2001 5.172 billion in 2006 and 5.750 billion in 2011. Among the various ecosystem services, the largest value is attributed to biodiversity protection, accounting for 35.59%. In contrast, the greatest increase was in the value from forest recreation, which was 36 times higher in 2006 than in 2001. The values of ecosystem services of various forest types correspond with the size of their areas. This suggests that the area, volume and value of natural forest ecosystem services in Buerjin County have significantly increased after implementing natural forest protection projects. ©, 2015, Beijing Forestry University. All right reserved. Source


Zhan M.K.,Chinese Academy of Forestry | Yang Z.Q.,Chinese Academy of Forestry | Wang X.Y.,Chinese Academy of Forestry | Zhang Y.L.,Chinese Academy of Forestry | Semi K.,Xinjiang Forestry Academy
Shengtai Xuebao/ Acta Ecologica Sinica | Year: 2014

To evaluate the control efficiency of the bethylid parasitoids in suppressing wood - borer pests for biological application of the insect natural enemy group resources, the functional response of Sclerodermus sp., (Hymenoptera: Bethylidae) on 3rd instar larvae of Monochamus alternatus Hope (Coleoptera: Cerambycidae) was studied. A consummate evaluation system of control efficiency was established and its feasibility was clarified. The evaluation system consists of four parts: the standard of experimental insects, study on biological characters of parasitism behavior of the bethylid, the functional response of parasitoid and Zhongqi Index. The results indicated that one bethylid female could control 3-4 3rd instar larvae of M. alternates, the maximum quantity of hosts had been killed was 9.07 in 21days, the Sclerodermus sp. had great potential for control the wood borer pest. The result of parasitism functional response on one parasitoid wasp to different diversities of hosts was consistent to the host-searching efficiency and similar to the impact on the fecundity. Comprehensive evaluation indicated that the control efficiency of the bethylid on 3rd instar larvae of M. alternates was highest at 1: 1 (releasing number property of parasitoid and its host), the Zhongqi Index was 39.63, which probably was caused by the bethylid's brood guarding behavior. That has certain similary with the observation on biological characters of parasitic behavior. Above all, the evaluation system is steadily, which could be used for biological control to screen out optimal parasitic wasp species for biological control application. Source


Liu G.-F.,Inner Mongolia University for Nationalities | Liu G.-F.,Chinese Academy of Forestry | Zang R.-G.,Chinese Academy of Forestry | Ding Y.,Chinese Academy of Forestry | And 6 more authors.
Forest Research | Year: 2011

In this study, Picea schrenkiana var. tianshanica forests in five different longitudinal sites (Zhaosu, Gongliu, Wusu, Urumqi and Hami) in Tianshan Mountains were investigated by using vertical transects. The percentage of trees in different sizes, the diameter classes distribution, and the fitted equations for accumulated stem percentage of P. schrenkiana var. tianshanica were analyzed in order to study the population diameter classes structure. The results showed that the decreasing order for percentage of seedling, sapling and the small trees is Hami, Urumqi, Gongliu, Zhaosu and Wusu. The distribution of stem abundance along the diameter classes in Zhaosu, Gongliu, Wusu, Urumqi and Hami all had an inversed "J" shape. The best fitted equation in Zhaosu and Urumqi for accumulated stem percentage of P. schrenkiana var. tianshanica was exponential, while the best one for another three sites was logarithmic. Gongliu preserves the best natural populations of P. schrenkiana var. tianshanica in terms of various size class analysis indexes. Source


Liu G.-F.,Inner Mongolia University for Nationalities | Liu G.-F.,Chinese Academy of Forestry | Ding Y.,Chinese Academy of Forestry | Zang R.-G.,Chinese Academy of Forestry | And 5 more authors.
Chinese Journal of Applied Ecology | Year: 2011

A vertical transect investigation on Picea schrenkiana var. tianschanica forests was conducted at five different longitudinal sites (Zhaosu, Gongliu, Wusu, Urumqi, and Hami) in Tianshan Mountains, and the distribution pattern of P. schrenkiana var. tianschanica population at each site was analyzed based on theoretical distribution model and aggregation intensity index. On the whole, the P. schrenkiana var. tianschanica population in Tianshan Mountains presented a clumped distribution, and the distribution pattern and clustering intensity were affected by the developmental stages of stem and the ranges of altitude to some degree. The clustering intensity increased with the increasing size (DBH) or developmental stage of stem, and had the highest values at high altitudes. Source


Liu G.,Inner Mongolia University for Nationalities | Liu G.,Chinese Academy of Forestry | Zang R.,Chinese Academy of Forestry | Cheng K.,Agricultural University of Hebei | And 6 more authors.
Chinese Journal of Applied and Environmental Biology | Year: 2011

Five vertical transects were investigated on the population dynamics of Picea schrenkiana var. tianschanica to lay a foundation for the population statistics and ecological protection. The transects were located from west to east along the Tianshan Mountains in Zhaosu, Gongliu, Wusu, Urumqi, and Hami of Xinjiang, China, respectively. The population static life tables were made, and the population curves of survivorship and mortality rate were formulated and drawn based on the data from 91 plots. The results showed that the survival curve of the populations could be generally summarized as the type of Deeveyll, suggesting stable population dynamics. There were two mortality peaks for each of the populations in the five sites. The mortality peaks could be for young, fore-adult, adult and old-age groups but varied significantly among the different sites. Source

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