中国草地地上生产力氮素敏感性的时空变化

doi:10.3864/j.issn.0578-1752.2022.09.010

Abstract

Abstract:

【Objective】This study was to investigate the temporal and spatial patterns of nitrogen (N) limitation (indicated by N response efficiency) on aboveground productivity of China’s grasslands, which was important for the adoptive management and accurately simulating of ecosystem N cycling under global environmental change. 【Method】A meta-analysis was performed to investigate N response ratio (lnRR) and N response efficiency (lnRR/N, the ratio of lnRR to N addition rate) of aboveground productivity across China’s grasslands. All data (423 groups) were collected from in-situ N addition experiments published over 1980-2020. Linear, double-linear and multi-step regressions were explored to estimate the spatial and temporal dynamics of lnRR/N and its driving factors. 【Result】In general, lnRR increased with N addition rates and saturated at (21.1±5.5) g N·m^-2·a^-1 (mean±95%CI) with the maximum of 0.60±0.08. lnRR/N was, on average, 0.043±0.004, i.e., aboveground productivity could increase by (4.36±0.38) % per unit N addition (1 g N·m^-2·a^-1). lnRR/N also differed significantly among grassland types, N addition rates, experimental durations, and years. Over the past four decades, lnRR/N significantly decreased, with a much (1.5-1.7 times) faster rate in the warmer (MAT>4.5℃) and wetter (MAP>450 mm) climatic regions than that in the cooler (MAT≤4.5℃) and drier (MAP≤450 mm) climatic regions. Regression analyses revealed that the spatial variation of lnRR/N was mainly driving by annual precipitation and soil fertility (i.e., soil N content). In general, lnRR/N increased along with MAP and decreased with soil N content. However, the driving factors varied by climatic regions, with both MAP and soil N content in the wetter regions, MAP in the drier regions and MAT in the warmer regions. 【Conclusion】 The aboveground productivity in China’s grasslands was still limited by N, but the extent of N limitation or N response efficiency decreased over time, especially in those wetter and warmer climatic regions. To accurately predict the response of grassland ecosystem to the ongoing global environmental change, the studies should pay more attention to the spatial and temporal shifting in driving factors for plant productivity.

Key words: grassland, aboveground productivity, nitrogen addition, nitrogen response efficiency, global environmental change

HOU JiangJiang,WANG JinZhou,SUN Ping,ZHU WenYan,XU Jing,LU ChangAi. Spatiotemporal Patterns in Nitrogen Response Efficiency of Aboveground Productivity Across China’s Grasslands[J].Scientia Agricultura Sinica, 2022, 55(9): 1811-1821.

Figures/Tables 6

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气候区 Climatic regions	逐步回归方程Step-wise regressions	df	R²
总体Overall	lnRR/N = -0.0011Year -0.0070 STN +0.81×10^-4MAP	315	0.09***
MAP≤450 mm	lnRR/N = -0.0008Year +2.35×10^-4MAP +0.0039 Duration +0.013	267	0.18***
MAP>450 mm	lnRR/N = -0.0025Year -0.014 STN +1.98×10^-4MAP -0.016	77	0.27***
MAT≤4.5℃	NA	NA	NA
MAT>4.5℃	lnRR/N = -0.0019Year -0.0098 MAT -0.011 Duration +0.055	93	0.25***

Spatiotemporal Patterns in Nitrogen Response Efficiency of Aboveground Productivity Across China’s Grasslands

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