Patterns and driving factors of WUE and NUE in natural forest ecosystems along the North-S

Patterns and driving factors of WUE and NUE in natural forest ecosystems along the North-South

Transect of Eastern China

SHENG Wenping;REN Shujie;YU Guirui;FANG Huajun;JIANG Chunming;ZHANG Mi

【期刊名称】《地理学报（英文版）》 【年(卷),期】2011(021)004

【摘要】From July 2008 to August 2008,72 leaf samples from 22 species and 81 soil samples in the nine natural forest ecosystems were collected,from north to south along the North-South Transect of Eastern China (NSTEC).Based on these samples,we studied the geographical distribution patterns of vegetable water use efficiency (WUE) and nitrogen use efficiency (NUE),and analyzed their relationship with environmental factors.The vegetable WUE and NUE were calculated through the measurement of foliar δ 13C and C/N of predominant species,respectively.The results showed:(1) vegetable WUE,ranging from 2.13 to 28.67 mg C g-1 H2O,increased linearly from south to north in the representative forest ecosystems along the NSTEC,while vegetable NUE showed an opposite trend,increasing from north to south,ranging from 12.92 to 29.60 g C g-1 N.(2) Vegetable WUE and NUE were dominantly driven by climate and significantly affected by soil nutrient factors.Based on multiple stepwise regression analysis,mean annual temperature,soil

phosphorus

concentration,and

soil

nitrogen