| 若尔盖地区草地沙化特征研究 |
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| 引用本文： | 张芮嘉,龙建,蒋伟,梁玉祥.若尔盖地区草地沙化特征研究[J].草原与草坪,2012,32(4):39-43. |
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| 作者姓名： | 张芮嘉 龙建 蒋伟 梁玉祥 |
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| 作者单位： | 四川大学化工学院,四川成都,610065 |
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| 基金项目： | 科技部国际合作重大项目 |
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| 摘 要： | 研究了若尔盖地区不同退化程度的草地土壤理化性质随土壤深度(0～60cm)的变化特征和草地的沙化机制。结果表明:草地退化是以0～30cm土层,土壤N、有机质和腐殖酸的流失为主要特征,当三者的流失率分别达到95.45%、98.85%、98.36%时,土壤P、K含量降低,草地盖度下降、生物量减少;随着草地退化程度的加深,在0～30cm土层,土壤水分含量不断降低而沙含量不断升高,全沙化草地水分含量在5%以下,沙含量达到98%;草地沙化从0～30cm土层开始,尤其是在20cm,土壤水分含量和沙含量的变化使得该土层成为沙化敏感区。
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| 关 键 词： | 若尔盖 草地 沙化特征 养分含量 有机质 |
Study on the desertification mechanism of the grassland in Zoige |
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| ZHANG Rui-jia,LONG Jian,JIANG Wei,LIANG Yu-xiang.Study on the desertification mechanism of the grassland in Zoige[J].Grassland and Turf,2012,32(4):39-43. |
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| Authors: | ZHANG Rui-jia LONG Jian JIANG Wei LIANG Yu-xiang |
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| Institution: | (College of Chemical Engineering, Sichuan University, Chengdu 610065, China) |
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| Abstract: | Physicochemical characteristics of soil in different degradatied grassland in Zoige were analyzed based on the soil layer（0-60 cm）. The results showed,the grassland degradation was characterized by the loss of soil ni 45%,98. creased. with the tion was trogen, organic matter and humus in the soil layer with 0-30 cm. When the w 85 % and 98.36 %, the content of soil phosphorus and potassium declined, the bi In the soil layer with 0-30 cm,moisture declined gradually,and the sediment degrad 98%. changes of mois ation deepening. The moisture of d Grassland degradation began in the ture and sediment concentration ma astage rate reached 95. omass and coverage de concentration increased esertified point was below 5%, and the sediment eoneentra- soil layer with 0-30 era,especially in 20 cm depth,and the de this layer become the desertification sensitive zone. |
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| Keywords: | Zoige desertification characters nutrient content organic matter desertification mechanism |
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