文献类型：期刊文献

英文题名：Effects of environmental variables on seedling distribution of rare and endangered Dacrydium pierrei

作者：Wu, Chunyan[1] Chen, Yongfu[] Chen, Qiao[1] Wang, Wenquan[1] Hong, Xiaojiang[2] Han, Wentao[2] Li, Xiaocheng[2]

通信作者：Chen, YF[1]

机构：[1]Chinese Acad Forestry, Res Inst Forest Resource Informat Tech, Beijing 100091, Peoples R China;[2]Hainan Bawangling Natl Nat Reserve, Changjiang 572722, Hainan, Peoples R China

年份：2017

卷号：12

期号：1

起止页码：345-355

外文期刊名：OPEN LIFE SCIENCES

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000415271000001)】；

基金：This study was supported by the National Natural Science Foundation of China (31270678). The authors thank the Bawangling Natural Reserve of Hainan Island who provided the test site and experimental materials, and Rucai Li, Zhengchong Zou and Shaoming Han for them taking part in the field seed collection during laboratory experiments.

语种：英文

外文关键词：Environment; seedling-sapling; soil moisture; PCA; GMM; Dacrydium pierrei

摘要：Because growth environment is affected by climate change, Dacrydium pierrei resources are becoming less and less. Therefore, understanding the effects of environmental variables on seedling-sapling distributions can help gain insight into changes in population recruitment in the context of climate change. The seedling-saplings distribution and variability of Dacrydium pierrei in environmental variables at Bawangling, Hainan, China, was surveyed over a 3-year period. In addition, laboratory experiments measuring the effects of soil moisture on seedling emergence were conducted to identify seedling development characteristics; principal component analysis (PCA) and Gaussian mixture model (GMM) were used to assess how different factors influenced Dacrydium pierrei seedlings-saplings distribution. The results demonstrated that the influence degree of seedling-sapling distribution is soil temperature>litter thickness>available phosphorus>canopy density>available potassium>nitrate nitrogen; a large number of seedling-saplings occurring at altitudes 1140-1300 m; a GMM trained with a C-2-L-3-H-4-A(5)-I-6 combination yielded an accuracy of 72.23% in simulating seedling-saplings distribution; temperature and precipitation have strong impact on seedling-sapling distribution, with increasing soil moisture, seedling emergence shows a positive relationship. This study focuses more on developing a new method for research on the seedling-sapling distribution of Dacrydium pierrei to get reference for its adaptive management with the intense extreme climate change.