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Grassland conversion along a climate gradient in northwest China: Implications for soil carbon and nutrients

文献类型： 外文期刊

作者： Huang, Xiaomin 1 ; Song, Zhenwei 2 ; van Groenigen, Kees Jan 3 ; Xu, Zhiyu 4 ; Huang, Bo 4 ; Zhang, Yi 5 ; Hang, Xiaon 1 ;

作者机构： 1.Nanjing Agr Univ, Coll Agr, Nanjing 210095, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Beijing, Peoples R China

3.Univ Exeter, Coll Climate & Environm Sci, Exeter, Devon, England

4.Minist Agr, Rural Energy & Environm Agcy, Beijing, Peoples R China

5.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing, Peoples R China

6.Chongqing Acad Agr Sci, Chongqing, Peoples R China

7.Renmin Univ China, Beijing, Peoples R China

8.Gansu Agr Univ, Lanzhou, Peoples R China

关键词： grasslands; land-use patterns; soil carbon stocks; soil nutrients availability

期刊名称：SOIL USE AND MANAGEMENT （ 影响因子：2.95； 五年影响因子：3.109 ）

ISSN： 0266-0032

年卷期：

页码：

收录情况： SCI

摘要： Soil organic carbon (SOC) stocks and nutrient availability are key indicators of soil quality, and both can be influenced by land-use change. However, it is still unclear whether the impact of land-use change on SOC and nutrient stocks differs between ecoregions. Grasslands near the northeast border of the Qinghai-Tibetan Plateau (QTP) occur across several ecoregions that have recently been subjected to substantial land-use change. Based on long-term land-use history, we conducted a field investigation comparing soil C and nutrient stocks between natural grassland (NGL) and three types of converted grassland (agricultural grassland, AGL; farmland, FL; and abandoned farmland, AFL) in three ecoregions along a climate gradient: alpine meadow, temperate steppe and temperate desert. Compared with NGL, soil C stocks in converted grasslands were 22%-30% lower in the alpine meadow, but 60-82% higher in the temperate steppe and 6%-76% higher in the temperate desert. Converted grasslands also contained higher stocks of available nitrogen and phosphorus than NGL in the temperate steppe and desert. Soils (0-40 cm) in NGL contained 14.8 +/- 0.1 kg C m(-2) in alpine meadow, 6.7 +/- 0.6 kg C m(-2) in temperate steppe and 1.7 +/- 0.3 kg C m(-2) in temperate desert. Together, our results indicate that the responses of soil C and nutrients to grassland conversion differed between ecoregions. Thus, to optimize soil C sequestration rates and overall soil quality, we suggest that land-use policies in this area should take into account local environmental conditions.

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