Effects of microtopography on spatial point pattern of forest stands on the semi-arid Loess Plateau,China

作     者：WeiJun ZHAO Yan ZHANG QingKe ZHU Wei QIN ShuZhen PENG Ping LI YanMin ZHAO Huan MA Yu WANG 

作者机构：Key Laboratory of Tourist Resources and Environment in Colleges and Universities of Shandong ProvinceTaishan University Forestry Ecological Engineering Research Center (Ministry of Education)Beijing Forestry University Department of SedimentationChina Institute of Water Resources and Hydropower Research Key Laboratory of Forest Ecology and Environment of State Forestry AdministrationInstitute of Forest EcologyEnvironment and ProtectionChinese Academy of Forestry 

出 版 物：《Journal of Arid Land》 (干旱区科学（英文版）)

年 卷 期：2015年第7卷第3期

页      面：370-380页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0709[理学-地质学] 0708[理学-地球物理学] 09[农学] 0815[工学-水利工程] 0705[理学-地理学] 0903[农学-农业资源与环境] 

基　　金：financially supported by China National Scientific and Technical Innovation Research Project for 12~(th) Five Year Plan (2011BAD38B0601) the National Natural Science Foundation of China (41472313) the Natural Science Foundation of Shandong Province (ZR2011DM012,ZR2014DL002) 

主　　题：microtopography univariate spatial patterns aggregation negative association positive association 

摘      要：Microtopography may affect the distribution of forests through its effect on rain redistribution and soil water distribution on the semi-arid Loess Plateau,*** this study,we investigated the characteristics of microtopography on two shady slopes（slope A,5 hm2,uniform slope;slope B,5 hm2,microtopography slope） and surveyed the height,the diameter at breast height and the location（x,y coordinates） of all selected individual trees（Robinia pseudoacacia Linn.,Pyrus betulifolia Bunge,Populus hopeiensis Hu ＆ Chow,Armeniaca sibirica Lam.,Populus simonii *** Ulmus pumila Linn.） on slope A and slope B in the watersheds of Wuqi county,Shaanxi ***,the effects of microtopography on the spatial pattern of forest stands were analyzed using Ripley＇s K（r） *** results showed that：（1） The maximal aggregation radiuses of the tree species on the uniform slope（slope A） were larger than 40 m,whereas those of the tree species on the microtopography slope（slope B） were smaller than 30 m.（2） On slope B,the spatial association of *** with ***,***,*** and *** varied from being strongly negative to positive at microtopography *** spatial association of Populus hopeiensis Hu ＆ Chow with *** also varied from being strongly negative to positive at microtopography ***,there was no spatial association between *** and ***,*** and ***,*** and ***,*** and ***,*** and ***,*** and ***,*** and ***,*** and ***,and *** and *** slope A,the spatial association between tree species were strongly *** results suggest that microtopography may shape tree distribution patterns on the semi-arid Loess Plateau.