| 土地利用变化对中国西南热带湿润地区土壤磷动态的影响 |
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| 作者姓名： | YANG Jing-Cheng HUANG Jian-Hui PAN Qing-Min TANG Jian-Wei HAN Xing-Guo |
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| 作者单位： | Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093 (China). E-mail: yjc1971@163.com;Beijing Natural History Museum, Beijing 100050 (China);Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093 (China). E-mail: yjc1971@163.com;Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093 (China). E-mail: yjc1971@163.com;Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Yunnan 666303 (China);Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093 (China). E-mail: yjc1971@163.com |
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| 基金项目： | *1Project supported by the National Natural Science Foundation of China (No.40071085). |
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| 摘 要： | Land use changes can greatly influence soil phosphorus (P) dynamics, especially when converting native forests to agricultural land. Soils in Xishuangbanna, which is one of southwest China’s tropical areas that maintain fragments of primary forests, were studied to a) evaluate the effect of two common land use changes, conversion of forests to agricultural land or rubber tree plantation, on the dynamics of available P and total P in bulk soils as well as total P in particle size fractions; b) assess the relationship between soil P dynamics and soil organic carbon (SOC); and c) elucidate the relationship between soil P content and soil properties such as pH and texture. Clearing secondary forests with subsequent shifting cultivation and establishment of rubber tree plantation caused significant decreases (P < 0.05) in available P in 0--20 cm soil depths, whereas for total P there was a significant decrease (P < 0.05) when converting to shifting cultivation, rubber tree plantation, or fallow fields at both 0--20 and 20--40 cm depths. Abandonment of fields used for shifting cultivation led to significant increases (P < 0.05) in available P at 20--40 cm depth. In addition, there was a significant positive relationship between soil organic carbon and soil P content. Compared to secondary forests, the ratio of organic carbon to total P in surface soils (0--20 cm) of shifting cultivation and rubber tree plantation was significantly lower (P < 0.05).
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| 关 键 词： | 土壤化学 磷动力学 颗粒尺寸 橡胶树 种植条件 |
Soil phosphorus dynamics as influenced by land use changes in humid tropical, southwest China |
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| YANG Jing-Cheng,HUANG Jian-Hui,PAN Qing-Min,TANG Jian-Wei,HAN Xing-Guo.Soil phosphorus dynamics as influenced by land use changes in humid tropical, southwest China[J].Pedosphere,2005,15(1):24-32. |
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| Authors: | YANG Jing-Cheng HUANG Jian-Hui PAN Qing-Min TANG Jian-Wei and HAN Xing-Guo |
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| Institution: | Laboratory of Quantitative Vegetation Ecology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China. |
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| Abstract: | Land use changes can greatly influence soil phosphorus (P) dynamics, especially when converting native forests to agricultural land. Soils in Xishuangbanna, which is one of southwest China's tropical areas that maintain fragments of primary forests, were studied to a) evaluate the effect of two common land use changes, conversion of forests to agricultural land or rubber tree plantation, on the dynamics of available P and total P in bulk soils as well as total P in particle size fractions; b) assess the relationship between soil P dynamics and soil organic carbon (SOC); and c) elucidate the relationship between soil P content and soil properties such as pH and texture. Clearing secondary forests with subsequent shifting cultivation and establishment of rubber tree plantation caused significant decreases (P < 0.05) in available P at 0-20 cm soil depths, whereas for total P there was a significant decrease (P < 0.05) when converting to shifting cultivation, rubber tree plantation, or fallow field at both 0-20 and 20-40 cm depths. Abandonment of fields used for shifting cultivation led to significant increases (P < 0.05) in available P at 20-40 cm depth. In addition, there was a significant positive relationship between soil organic carbon and soil P content. Compared to secondary forests, the ratio of organic carbon to total P in surface soils (0-20 cm) of shifting cultivation and rubber tree plantation was significantly lower (P < 0.05). |
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| Keywords: | land use change particle size fraction phosphorus rubber tree plantation shifting cultivation |
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