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Effects of grazing disturbance of spatial distribution pattern and interspecies relationship of two desert shrubs

Journal of Forestry Research 2022年第2期33卷 507-518页

作者： Lei Zhang Yong Gao Jinrong Li Chao Zhang Minyu Li Zhao Hu Xiangxin Cui College of Desert Science and Engineering Inner Mongolia Agricultural UniversityHohhot 010019People’s Republic of China Institute of Water Resources for Pastoral Area of the Ministry of Water Resources Hohhot 010020People’s Republic of China Institute of Forestry Monitoring and Planning of Inner Mongolia Autonomous Region Hohhot 010020People’s Republic of China School of Soil and Water Conservation Beijing Forestry UniversityBeijing 100083People’s Republic of China

Grazing significantly affects the distribution,growth,and productivity of *** this study,we evalu-ated the effects of grazing disturbance on the spatial distri-bution patterns and interspecific relationships of two desert shrubs,Ammopiptanthus mongolicus and Sarcozygium *** types of grazing conditions were considered,including enclosed area(EA),seasonal rotational grazing area(SRGA),and grazing area(GA)(100 m×100 m),in the West Ordos Nature Reserve of Inner Mongolia,*** results showed that *** and *** populations were uniformly distributed at a small scale,and the distribution in EA and SRGA became gradually *** GA,*** population showed aggregated distribution but *** population showed random distribution at a small scale. Moreover, both A. mongolicus and S. xanthoxylon populations at the 5-7 m scale showed random distribution. At the small and intermediate scales, the two species showed positive interspecific relationships of GA. However, no interspecific relationship was noted between the two species in EA and SRGA. A significant positive relationship (P < 0.01) was noted between the two species at 2-9 m and a negative relationship (P < 0.01) at 13-17 m scales in GA. Positive relationship (P < 0.01) was noted between the two species at 6-13 m scales and a sig-nificant negative relationship (P < 0.01) at 14-24 m scales in SRGA. The two species of desert shrubs showed posi-tive interspecific relationships at the small scale, and they showed negative relationships as the interspecific compe-tition intensified in the presence of grazing disturbance. When the grazing intensity exceeds a certain threshold, the interspecific relationships become weak. Therefore, moder-ate grazing would facilitate interspecific competition and species succession, whereas excessive grazing would disrupt natural competition causing desertification ultimately.

关键词： extending point pattern analysis Grazing Interspecific relationships Unmanned aerial vehicle(UAV)

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