Tree species richness enhances stand productivity while stand structure can have opposite effects, based on forest inventory data from Germany and the United States of America  

作　　者：Laura Zeller Jingjing Liang Hans Pretzsch Laura Zeller;Jingjing Liang;Hans Pretzsch(Center of Life and Food Sciences Weihenstephan, Technical University of Munich, Hans-Carl von-Carlowitz Platz;, 85354 Freising, Germany Full list of author information is availabJe at the end of the article)

机构地区：[1]Center of Life and Food Sciences Weihenstephan,Technical University of Munich,Hans-Carl-von-Carlowitz-Platz 2,85354 Freising,Germany [2]Division of Forestry and Natural Resources,Davis College of Agriculture,Natural Resources&Design,West Virginia University,340 Percival Hall,Morgantown,WV 26506-6108,USA

出　　处：《Forest Ecosystems》2018年第1期36-52,共17页森林生态系统（英文版）

基　　金：supported in parts by the Biodiv ERs A project, “Green Future Forests” (#01LC1610B);the FORD project Biotip (#01LC1716D)promoted by the German Aerospace Center (DLR);the Federal Ministry of Education and Research, the project Sumforest – REFORM Risk Resilient Forest Management (#2816ERA02S);by the West Virginia University, and the USDA Mc Intire-Stennis Funds WVA00126;the Bavarian State Ministry of Nutrition, Agriculture, and Forestry for permanent support of the project W 07 “Long-term experimental plots for forest growth and yield research” (#7831-22209-2013)

摘　　要：Background： in recent studies, mixed forests were found to be more productive than monocultures with everything else remaining the same. Methods： To find out if this productivity is caused by tree species richness, by a more heterogeneous stand structure or both, we analyzed the effects of forest structure and tree species richness on stand productivity, based on inventory data of temperate forests in the United States of America and Germany. Results： Having accounted for effects such as tree size and stand density, we found that： （I） tree species richness increased stand productivity in both countries while the effect of tree size heterogeneity on productivity was negative in Germany but positive in the USA; （11） productivity was highest at sites with an intermediate amount of precipitation; and （111） growth limitations due water scarcity or low temperature may enhance structural heterogeneity. Conclusions： In the context of forest ecosystem goods and services, as well as future sustainable forest resource management, the associated implications would be：Background： in recent studies, mixed forests were found to be more productive than monocultures with everything else remaining the same. Methods： To find out if this productivity is caused by tree species richness, by a more heterogeneous stand structure or both, we analyzed the effects of forest structure and tree species richness on stand productivity, based on inventory data of temperate forests in the United States of America and Germany. Results： Having accounted for effects such as tree size and stand density, we found that： （I） tree species richness increased stand productivity in both countries while the effect of tree size heterogeneity on productivity was negative in Germany but positive in the USA; （11） productivity was highest at sites with an intermediate amount of precipitation; and （111） growth limitations due water scarcity or low temperature may enhance structural heterogeneity. Conclusions： In the context of forest ecosystem goods and services, as well as future sustainable forest resource management, the associated implications would be：

关 键 词：Big data OVERYIELDING Tree size heterogeneity Tree species mixing Climate Biodiversity-productivityrelationship 

分 类 号：S718.5[农业科学—林学] TG659[金属学及工艺—金属切削加工及机床]