Temporal and spatial variation characteristics of China shrubland net primary production and its response to climate change from 2001 to 2013

doi:10.17521/cjpe.2016.0177

Abstract

Abstract:

Aims Net primary production (NPP) is the input to terrestrial ecosystem carbon pool. Climate and land use change affect NPP significantly. Shrublands occupy more than 20% of the terrestrial area of China, and their NPP is comparable to those of the forests. Our objective was to estimate China shrubland NPP from 2001 to 2013, and to analyze its variation and response to climate change.Methods We used a Carnegie-Ames-Stanford Approach (CASA) model to estimate the NPP of six shrubland types in China from 2001 to 2013. Furthermore, we used Theil-Sen slope combined with Mann-kendall test to analyze its spatial variation and a linear regression of one-variable model to analyze its inter- and intra-annual variation. Finally, a multi-factor linear regression model was used to analyze its response to climate change.Important findings We found the annual mean NPP of China shrubland was 281.82 g•m^-2•a^-1. The subtropical evergreen shrubland has the maximum NPP of 420.47 g•m^-2•a^-1, while the high cold desert shrubland has the minimum NPP of 52.65 g•m^-2•a^-1. The countrywide shrublands NPP increased at the rate of 1.23 g•m^-2•a^-1, the relative change rate was 5.99%. The temperate deciduous shrubland NPP increased the fastest with a speed of 3.05 g•m^-2•a^-1 and subalpine evergreen shrubland had a decreasing trend with a speed of -0.73 g•m^-2•a^-1. Moreover, the other four shrublands NPP had a growing trend, only subalpine deciduous shrubland NPP did not change significantly. The response of NPP to climate change of different seasons varies to different shrubland types. In general, the NPP variation was mainly affected by precipitation, and the spring warming also contributed to it. The increase of countrywide shrubland NPP may promote its contribution to the regional ecosystem function.

http://jtp.cnki.net/bilingual/detail/html/ZWSB201709001

Key words: CASA model, net primary production (NPP), shrub, carbon balance, climate change

Ya-Lin WANG, Rong GONG, Feng-Min WU, Wen-Wu FAN. Temporal and spatial variation characteristics of China shrubland net primary production and its response to climate change from 2001 to 2013[J]. Chin J Plant Ecol, 2017, 41(9): 925-937.

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Figures/Tables 11

References 58

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	DCDSMT	DCDSTP	DSRTHC	DSRTTP	EVGNMT	EVGNST
实际面积 Actual area (km²)	87 701	163 077	113 031	1 068 218	188 952	467 142
实际计算面积 Actual calculated area (km²)	81 029	153 349	12 409	203 125	178 435	449 461

	DCDSMT	DCDSTP	DSRTHC	DSRTTP	EVGNMT	EVGNST
实际面积 Actual area (km²)	87 701	163 077	113 031	1 068 218	188 952	467 142
实际计算面积 Actual calculated area (km²)	81 029	153 349	12 409	203 125	178 435	449 461

灌木类型 Shrubland type	平均净初级生产力 Mean net primary production (g•m^-2•a^-1)	平均净初级生产力总量 Mean total net primary production (Tg)
DCDSMT	252.28 ± 8.64	20.44 ± 0.70
DCDSTP	247.24 ± 14.12	37.91 ± 2.17
DSRTHC	52.65 ± 3.05	0.65 ± 0.04
DSRTTP	72.33 ± 5.67	14.69 ± 1.15
EVGNMT	288.07 ± 11.84	51.40 ± 2.11
EVGNST	420.47 ± 16.96	188.98 ± 7.62
CONTRY	281.82 ± 10.13	302.94 ± 10.89

灌木类型 Shrubland type	平均净初级生产力 Mean net primary production (g•m^-2•a^-1)	平均净初级生产力总量 Mean total net primary production (Tg)
DCDSMT	252.28 ± 8.64	20.44 ± 0.70
DCDSTP	247.24 ± 14.12	37.91 ± 2.17
DSRTHC	52.65 ± 3.05	0.65 ± 0.04
DSRTTP	72.33 ± 5.67	14.69 ± 1.15
EVGNMT	288.07 ± 11.84	51.40 ± 2.11
EVGNST	420.47 ± 16.96	188.98 ± 7.62
CONTRY	281.82 ± 10.13	302.94 ± 10.89

TS	Z	净初级生产力的变化趋势 Trend of net primary production	占总面积比例 Percentage of total area (%)
>0	>1.96	显著增加 Significantly increased	13.14
>0	-1.96-1.96	不显著增加 Insignificantly increased	58.09
0	-1.96-1.96	基本不变 Essentially unchanged	0.01
<0	-1.96-1.96	不显著减小 Insignificantly decreased	26.81
<0	<-1.96	显著减小 Significantly decreased	1.95