Global patterns in above-ground net primary production and precipitation-use efficiency in grasslands Global patterns in above-ground net primary production and precipitation-use efficiency in grasslands

最小化 最大化

Vol15 No.8: 1682-1692

Title】Global patterns in above-ground net primary production and precipitation-use efficiency in grasslands

Author】QIN Xiao-jing1,2#; HONG Jiang-tao1#; MA Xing-xing3; WANG Xiao-dan1*

Addresses】1 Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Science, Chengdu 610041, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 College of Urban and Environment Sciences, Shanxi Normal University, Linfen 041000, China

Corresponding author】HONG Jiang-tao; WANG Xiao-dan

Citation】Qin XJ, Hong JT, Ma XX, Wang XD (2018) Global patterns in above ground net primary production and precipitation-use efficiency of grasslands. Journal of Mountain Science 15(8). https://doi.org/10.1007/s11629-017-4772-6

DOI】https://doi.org/10.1007/s11629-017-4772-6

Abstract】The above-ground net primary production (ANPP) and the precipitation-use efficiency (PUE) regulate the carbon and water cycles in grassland ecosystems, but the relationships among the ANPP, PUE and precipitation are still controversial. We selected 717 grassland sites with ANPP and mean annual precipitation (MAP) data from 40 publications to characterize the relationships ANPP–MAP and PUE–MAP across different grassland types. The MAP and ANPP showed large variations across all grassland types, ranging from 69 to 2335 mm and 4.3 to 1706 g m−2, respectively. The global maximum PUE ranged from 0.19 to 1.49 g m−2 mm−1 with a unimodal pattern. Analysis using the sigmoid function explained the ANPP–MAP relationship best at the global scale. The gradient of the ANPP–MAP graph was small for arid and semi-arid sites (MAP <400 mm). This study improves our understanding of the relationship between ANPP and MAP across dry grassland ecosystems. It provides new perspectives on the prediction and modeling of variations in the ANPP for different grassland types along precipitation gradients.

Keywords】Litter decomposition; Alpine communities; Tea bag index; Carbon cycleAbove-ground net primary production; Precipitation-use efficiency; Sigmoid function; Precipitation gradients.