| 青藏高原高寒湿地不同季节土壤理化性质对放牧模式的响应 |
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| 引用本文： | 何贵永,孙浩智,史小明,齐威,杜国祯.青藏高原高寒湿地不同季节土壤理化性质对放牧模式的响应[J].草业学报,2015,24(4):12-20. |
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| 作者姓名： | 何贵永 孙浩智 史小明 齐威 杜国祯 |
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| 作者单位： | 兰州大学生命科学学院,草地农业生态系统国家重点实验室,甘肃 兰州 730000 |
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| 基金项目： | 国家自然科学基金重点项目，国家自然科学基金面上项目(41171214)资助。 |
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| 摘 要： | 本文分析了青藏高原东缘高寒湿地在全年放牧、冬季放牧和全年禁牧3种放牧模式下土壤理化性质的变化,探讨其在不同土层深度的变化及季节性动态。结果如下:1)沿着全年禁牧—冬季放牧—全年放牧3种放牧模式,土壤表层(0~15 cm)及下层(15~30 cm)的土壤含水量和有机碳含量显著减小。2)土壤含水量、有机碳、全氮、全磷和速效氮含量均随土层深度的增加而降低,而速效磷表现为无规律。3)3种放牧模式下表层土壤有机碳含量均为:9月>5月>7月;全氮和全磷含量一般都在9月份较高,而速效氮和速效磷含量9月份最低,每种放牧模式下它们之间的具体差异也不完全相同。4)除5月份,两个土层土壤全氮含量均与有机碳含量呈极显著正相关。综上,全年放牧模式加快了土壤中C、N、P的周转,使土壤养分输出量增加,进而导致土壤肥力下降,草地退化。
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| 关 键 词： | 青藏高原 高寒湿地 放牧模式 季节变化 土壤理化性质 |
| 收稿时间： | 2013-12-12; |
| 修稿时间： | 2014-02-25 |
Soil properties of Tibetan Plateau alpine wetland affected by grazing and season |
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| HE Gui-Yong,SUN Hao-Zhi,SHI Xiao-Ming,QI Wei,DU Guo-Zhen.Soil properties of Tibetan Plateau alpine wetland affected by grazing and season[J].Acta Prataculturae Sinica,2015,24(4):12-20. |
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| Authors: | HE Gui-Yong SUN Hao-Zhi SHI Xiao-Ming QI Wei DU Guo-Zhen |
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| Institution: | State Key Laboratory of Grassland and Agro-Ecosystems, School of Life Sciences, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | The seasonal characteristics of soil physical and chemical properties under different grazing patterns (annual grazing, winter grazing, no-grazing) were studied on an alpine wetland of the eastern Tibet Plateau. The main results were: soil moisture and soil organic carbon content at the surface(0-15 cm)and sub-surface (15-30 cm) layers were highest under non-grazing and lowest under annual grazing. 2) For all treatments, soil moisture, organic carbon, total nitrogen, total phosphorus and available nitrogen significantly declined with increasing soil depth, however, available phosphorus was not affected by soil depth. 3) The surface soil organic carbon content of all treatments showed the same seasonal pattern; September>May>July and soil total nitrogen and total phosphorus content were generally higher in September. 4) Total nitrogen content in both soil layers were significantly positively correlated with soil organic carbon content in July and September. It is concluded that annual grazing increases carbon, nitrogen and phosphorus cycling and increases nutrient losses, leading to decreased soil fertility and declining grassland quality. |
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| Keywords: | Tibetan Plateau alpine wetland grazing soil seasonal changes soil physica1 and chemical proper-ties |
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