陕北黄土区微地形土壤有效水饱和度

发布时间：2018-04-13 19:50

本文选题：陕北黄土区 + 阳向陡坡　；参考：《干旱地区农业研究》2017年04期

【摘要】：为了明确不同微地形土壤有效水饱和度的特征以及与植被群落特征的关系,采用小波分析、回归分析和Mann-Kendall趋势检验等方法,分析了陕北黄土区阳向陡坡不同微地形0~60 cm土层深度的土壤有效水饱和度。结果表明:(1)在0~60 cm土层深度范围内,不同微地形土壤有效水饱和度顺序为塌陷缓台原状坡切沟浅沟陡坎,其中切沟、塌陷和陡坎的土壤有效水饱和度呈现显著增加趋势,浅沟、缓台和原状坡的土壤有效水饱和度呈现下降趋势,但趋势不显著;(2)研究期间,不同微地形土壤有效水饱和度的变化周期不同,陡坎、塌陷和缓台的主周期相同,为22个月,浅沟、切沟和原状坡的主周期分别为23、21个月和28个月;(3)在不同微地形中,Margalef丰富度指数、Shannon-Wiener多样性指数、Simpson多样性指数和Alatalo均匀度指数均与土壤有效水饱和度呈正相关关系,其中Shannon-Wiener多样性指数和土壤有效水饱和度的相关性最高。
[Abstract]:In order to determine the characteristics of soil available water saturation in different microtopography and its relationship with vegetation community characteristics, wavelet analysis, regression analysis and Mann-Kendall trend test were used.The soil available water saturation of different microtopography (0 ~ 60 cm depth) on the sunny steep slope in the loess area of northern Shaanxi was analyzed.The results showed that the order of soil effective water saturation in different microtopography in the depth of 0 ~ 60 cm soil layer was as follows: collapse platform, undisturbed slope, shallow gully and steep ridge, in which the effective water saturation of cut ditch, collapse and steep ridge showed a significant increase trend, shallow ditch, shallow gully, shallow gully, shallow gully, shallow gully, shallow gully, shallow gully, shallow gully, shallow gully,During the study period, the change period of soil effective water saturation in different microtopography was different, the main period of steep ridge, collapse and gentle platform was the same, which was 22 months.The main periods of shallow gully, cut furrow and undisturbed slope were 23, 21 and 28 months respectively. In different microlandforms, Shannon-Wiener diversity index, Alatalo evenness index and Shannon-Wiener diversity index were positively correlated with soil available water saturation.The correlation between Shannon-Wiener diversity index and soil available water saturation was the highest.
【作者单位】：北京林业大学水土保持学院;
【基金】：“十二五”国家科技支撑计划课题(2015BAD07B02) 深圳市铁汉生态环境股份有限公司合作项目(THRD002)
【分类号】：S152.7

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