干旱区研究 ›› 2023, Vol. 40 ›› Issue (10): 1615-1624.doi: 10.13866/j.azr.2023.10.08 cstr: 32277.14.j.azr.2023.10.08
收稿日期:
2023-03-08
修回日期:
2023-06-27
出版日期:
2023-10-15
发布日期:
2023-11-01
作者简介:
刘新(1997-),男,硕士研究生,主要从事土壤恢复生态遥感工作. E-mail: 基金资助:
LIU Xin(),HAO Yuanyuan(),HUA Limin
Received:
2023-03-08
Revised:
2023-06-27
Published:
2023-10-15
Online:
2023-11-01
摘要:
明晰土壤盐分空间变异性是土壤盐渍化程度研究和盐碱地改良的前提。本研究选取干旱内陆河流域石羊河下游民勤盆地为研究区,通过对0~30 cm土层土壤盐分原位数据统计学特征、空间自相关性、变异性和分布格局的分析,探讨民勤盆地土壤盐分空间异质性变化规律,以期为研究区土壤盐渍化治理提供理论依据。结果显示:(1)实测土壤盐分含量和变化范围均随土层加深而变小,且均呈偏正态分布。(2)Moran’s I 指数均呈“∽”型波动趋势且值域范围随土层加深而变大,正(负)空间自相关性均随距离的增大而减小(0~10 cm负的空间自相关性相反)。(3)变异函数均以指数模型为最好,R2随土层加深而变大(0.62→0.69→0.81),RSS均是0.0002,C0/(C0+C)和A0变化规律一致,随着土层加深空间异质性由弱到强烈再到中等。(4)插值精度10~20 cm > 20~30 cm > 0~10 cm。3个土层土壤盐分均存在空间分异特性,水平方向(同一土层)上,盐渍化程度均自西南向东北逐渐增加;垂直方向(不同土层)上,分布规律由简单到复杂,从聚集状态(0~10 cm)逐渐趋于斑块化(10~20 cm)和斑点化(20~30 cm)。非盐化土(<1.50%)和4种不同程度盐渍土在3个土层中均有分布,盐渍土面积中度(>70.00%)>强度(约20.00%)>轻度(约9.00%)>盐土(<0.50%)。
刘新, 郝媛媛, 花立民. 石羊河下游民勤盆地土壤盐分空间分异特征[J]. 干旱区研究, 2023, 40(10): 1615-1624.
LIU Xin, HAO Yuanyuan, HUA Limin. Spatial differentiation characteristics of soil salinity in Minqin Basin, downstream of Shiyang River, China[J]. Arid Zone Research, 2023, 40(10): 1615-1624.
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