| 祁连山不同退化草地土壤养分变化特征及质量综合评价 |
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| 引用本文： | 马亚春,张洁,高亚敏,姚拓,李海云,李昌宁,金艳丽.祁连山不同退化草地土壤养分变化特征及质量综合评价[J].草地学报,2022,30(7):1621-1629. |
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| 作者姓名： | 马亚春 张洁 高亚敏 姚拓 李海云 李昌宁 金艳丽 |
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| 作者单位： | 1. 甘肃农业大学草业学院, 甘肃 兰州 730070;2. 甘肃省草原技术推广总站, 甘肃 兰州 730010;3. 西北农林科技大学资源环境学院, 陕西 杨凌 712100;4. 兰州大学西部生态安全省部共建协同创新中心, 甘肃 兰州 730000 |
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| 基金项目： | 甘肃省林业和草原局(GFG2019-366-2)；生物炭制备关键技术及在草原生态修复中的应用研究(2020KJ081)资助 |
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| 摘 要： | 为探究祁连山不同退化草地土壤特性的变化规律，在2017和2018年持续对祁连山同一区域不同退化程度草地(轻度退化草地、中度退化草地和重度退化草地)土壤养分、生态化学计量比和土壤环境肥力综合评价系数进行研究。结果表明：2018年，各试验点土壤有机碳、全氮和全磷含量均随着土层深度的增加而减小，且差异显著(P<0.05)；各试验点土壤碱解氮和有效磷含量均随退化程度的加剧和土层深度的增加而减小；不同退化草地不同土层中，C/N变化范围为16.00~75.54，C/P变化范围为90.01~182.65，N/P变化范围为1.68~9.33。土壤环境肥力质量评价指数结果表明，整体两年中土壤肥力质量综合排序为：天祝县抓喜秀龙乡(1.00)>肃南县康乐镇(0.89)>肃南县皇城镇(0.84)，且综合评价系数都表现为随退化程度的加剧而减小的趋势。综上，祁连山不同程度退化草地土壤已逐步恶化，需重视并采取合理措施保护。
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| 关 键 词： | 祁连山 退化草地 土壤理化特征 生态化学计量比 土壤环境肥力综合评价 |
| 收稿时间： | 2021-11-24 |
Comprehensive Evaluation on Soil Nutrient Change Characteristics and Quality of Different Degraded Grasslands in Qilian Mountains |
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| MA Ya-chun,ZHANG Jie,GAO Ya-min,YAO Tuo,LI Hai-yun,LI Chang-ning,JIN Yan-li.Comprehensive Evaluation on Soil Nutrient Change Characteristics and Quality of Different Degraded Grasslands in Qilian Mountains[J].Acta Agrestia Sinica,2022,30(7):1621-1629. |
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| Authors: | MA Ya-chun ZHANG Jie GAO Ya-min YAO Tuo LI Hai-yun LI Chang-ning JIN Yan-li |
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| Institution: | 1. Pratacultural College, Gansu Agricultural University, Key Laboratory of Grassland Ecosystem, Lanzhou, Qinghai Province, 730070, China;2. Grassland Technical Extension Station of Gansu Province, Lanzhou, Qinghai Province 730010, China;3. College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, China;4. Lanzhou University, Collaborat Innovat Ctr Western Ecol Safety, Lanzhou, Qinghai Province 730000, China |
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| Abstract: | In order to explore the variation law of soil characteristics of different degraded grasslands in Qilian Mountains,the soil nutrients,ecological stoichiometric ratios and comprehensive evaluation coefficients of soil environmental fertility of grasslands with different degrees of degradation (lightly degraded grassland,moderately degraded grassland and severely degraded grassland) in the same area of the Qilian Mountains were continuously studied in 2017 and 2018. The results showed that the contents of soil organic carbon,total nitrogen and total phosphorus decreased with the increase of soil depth in 2018,and the differences were significant(P<0.05);the contents of soil alkaline hydrolyzable nitrogen and available phosphorus decreased with the aggravation of degradation degree and the increase of soil depth;C/N,C/P,N/P ranged from 16.00 to 75.54,90.01 to 182.65,and 1.68 to 9.33 in different soil layers of different degraded grasslands,respectively. The results of soil environmental fertility quality evaluation index showed that the overall ranking of soil fertility quality in the two years was Tianzhu County in Zhuoxixiulong Town(1.00)>Sunan County in Kangle Town(0.89)>Sunan County in Huangcheng Town(0.84),and the comprehensive evaluation coefficients all showed a decreasing trend with the intensification of the degradation degree;the Qilian Mountains soil total phosphorus fertilizer index reached the extreme poor standard (Pi < 1) for two consecutive years. To sum up,the degraded grassland soils in different degrees of Qilian Mountains had gradually deteriorated,and it was necessary to pay attention and take reasonable measures to protect them. |
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| Keywords: | Qilian Mountain Grassland degradation Soil nutrient Ecological stoichiometric ratio Fertility quality evaluation |
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