| 基于水分的北方农牧交错带植被生态系统退化机理研究 |
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| 引用本文： | 夏哲超,潘志华,张璐阳,周蒙蒙,潘学标,妥德宝,赵沛义.基于水分的北方农牧交错带植被生态系统退化机理研究[J].资源科学,2010,32(2):317-322. |
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| 作者姓名： | 夏哲超 潘志华 张璐阳 周蒙蒙 潘学标 妥德宝 赵沛义 |
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| 作者单位： | 夏哲超,XIA Zhe-chao(中国农业大学资源与环境学院,北京 1001932;农业部呼和浩特农牧交错带生态环境重点野外科学观测试验站,呼和浩特 011705;中国农业大学资源与环境学院,北京,1001932.农业部呼和浩特农牧交错带生态环境重点野外科学观测);潘志华,张璐阳,潘学标,PAN Zhi-hua,ZHANG Lu-yang,PAN Xue-biao(中国农业大学资源与环境学院,北京 1001932;农业部呼和浩特农牧交错带生态环境重点野外科学观测试验站,呼和浩特 011705);周蒙蒙,ZHOU Meng-meng(中国农业大学资源与环境学院,北京 1001932;农业部呼和浩特农牧交错带生态环境重点野外科学观测试验站,呼和浩特 011705;农业);妥德宝,赵沛义,TUO De-bao,ZHAO Pei-yi(农业部呼和浩特农牧交错带生态环境重点野外科学观测试验站,呼和浩特,011705) |
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| 基金项目： | 国家自然科学基金，国家自然科学基金，国家支撑计划，国家支撑计划 |
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| 摘 要： | 水是北方农牧交错带最关键的生态环境因子,水资源与生态环境之间的相互关系和相互影响很大程度上决定了北方农牧交错带的环境状况与环境动态.文章从生态缺水的角度,以内蒙古自治区武川县为例,探讨了生态系统退化机理,为北方农牧交错带的生态恢复与重建提供科学依据.研究结果表明,生态缺水是造成北方农牧交错带植被生态系统退化的主要原因.2006年武川县天然草地、灌木、乔木、农作物生长季平均耗水量分别为150.3mm、193.4mm、213.3mm、158.6mm,最小生态缺水量分分别为93.1mm、38.2mm、251.5mm、96.6mm,植被生态系统继续向退化方向演替.合理调整植物品种结构,配置有限的水资源是当地生态恢复与重建的紧迫任务.
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| 关 键 词： | 生态需水 生态缺水 生态退化机理 北方农牧交错带 武川县 |
| 收稿时间： | 4/9/2009 12:00:00 AM |
Examining Mechanisms of Vegetation Ecosystems Degradation Based on Water in Northern Farming-pastoral Zone |
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| XIA Zhechao,PAN Zhihu,ZHANG Luyan,ZHOU Mengmeng,PAN Xuebiao,TUO Debao and ZHAO Peiyi.Examining Mechanisms of Vegetation Ecosystems Degradation Based on Water in Northern Farming-pastoral Zone[J].Resources Science,2010,32(2):317-322. |
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| Authors: | XIA Zhechao PAN Zhihu ZHANG Luyan ZHOU Mengmeng PAN Xuebiao TUO Debao and ZHAO Peiyi |
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| Abstract: | The issues of ecological water requirements have already been a focus of research in the context of increasingly aggravated eco-environment. The ecological water requirement is defined as the water capacity needed by the ecosystem which achieves a certain ecology level or maintains a certain dynamic balance status. The ecological water requirement would be different for different regions and different ecological objectives. Water is the most critical ecological factor over the northern farming-pastoral zones in China. The interrelations and interactions between water and the eco-environment to a large extent dictate the environmental dynamics and status of the northern farming-pastoral zones. In the present work, the authors investigated the mechanisms of the degradation of ecosystems from a perspective of ecological water shortage, with the aim to provide meaningful reference for ecological restoration and reconstruction in the northern farming-pastoral zones. The vegetation ecological water requirements for the Wuchuan County, a typical dry and semi-arid agro-pastoral transitional zone located in the middle part of the northern ecotone and facing serious ecological degradation, were calculated with the Penman-Monteith equation. In addition, the status of ecological water shortage in Wuchuan County was analyzed in detail on the basis of the experimental data of vegetation ecological water consumptions. The results showed that the major reason for degradation of vegetation ecosystems in the northern ecotone was ecological water shortage. The average water consumptions of natural grassland, shrubbery land, arbor land and cropland in Wuchuan County during growing season in 2006 were estimated to be 150.3 mm, 193.4 mm, 213.3 mm and 158.6 mm, respectively. The smallest amounts of ecological water shortage were estimated to be 93.1 mm, 38.2 mm, 251.5 mm, and 96.6 mm, respectively. It was found that vegetation of the ecosystem continued to develop towards the direction of degradation. Reasonable adjustments for the structure of plant species and reasonable allocation for limited water resources were the urgent needs for local ecological restoration and reconstruction. As to the ecological water shortage which caused the ecological degradation in Wuchuan County, the rational allocation for the limited water resource is to increase water supplies for vegetation ecosystems and to make the ecological water consumptions achieve the minimum even the optimum demands for ecological water requirements. Due to combined effects of a variety of factors, the processes of ecological degradation are quite long and complex. To this end, more comprehensive studies are needed in the future. |
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| Keywords: | Ecological water requirement Ecological water shortage Ecological degradation mechanism Northern farming-pastoral zone Wuchuan country |
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