张志坚, 刘亮英, 刘苑秋, 吴春生, 丘满圆, 郭锦荣, 邓文平. 退化红壤区植被恢复过程夏季土壤水分时空变异格局动态[J]. 西南林业大学学报, 2017, 37(3): 88-94. DOI: 10.11929/j.issn.2095-1914.2017.03.014
引用本文: 张志坚, 刘亮英, 刘苑秋, 吴春生, 丘满圆, 郭锦荣, 邓文平. 退化红壤区植被恢复过程夏季土壤水分时空变异格局动态[J]. 西南林业大学学报, 2017, 37(3): 88-94. DOI: 10.11929/j.issn.2095-1914.2017.03.014
Zhijian Zhang, Liangying Liu, Yuanqiu Liu, Chunsheng Wu, Manyuan Qiu, Jinrong Guo, Wenping Deng. Spatiotemporal Variation of Soil Moisture in Summer Season During Process of Vegetation Restoration in Degraded Red Soil Region[J]. Journal of Southwest Forestry University, 2017, 37(3): 88-94. DOI: 10.11929/j.issn.2095-1914.2017.03.014
Citation: Zhijian Zhang, Liangying Liu, Yuanqiu Liu, Chunsheng Wu, Manyuan Qiu, Jinrong Guo, Wenping Deng. Spatiotemporal Variation of Soil Moisture in Summer Season During Process of Vegetation Restoration in Degraded Red Soil Region[J]. Journal of Southwest Forestry University, 2017, 37(3): 88-94. DOI: 10.11929/j.issn.2095-1914.2017.03.014

退化红壤区植被恢复过程夏季土壤水分时空变异格局动态

Spatiotemporal Variation of Soil Moisture in Summer Season During Process of Vegetation Restoration in Degraded Red Soil Region

  • 摘要: 用经典统计学和地统计学方法,对比分析江西泰和退化红壤丘陵区重建森林及自然恢复草地15 a、25 a土壤(0~20 cm和20~40 cm土层)水分空间变异格局。结果表明:在恢复初期,重建森林和自然恢复草地土壤水分较为均匀,随着恢复年限的增加,土壤水分逐渐增加,且离散程度存在不同程度的提高和中等程度变异; 重建森林及自然恢复草地土壤水分分布呈正态分布,均能较好的拟合成球状模型(决定系数均> 0.804),数据表现出明显的空间自相关,具有一定的空间变异特征,变异来源主要以土壤母质、地形等引起的结构性变异为主。从时间序列上看,恢复25 a土壤水分块金值、基台值、块金系数均显著增大,总的变异性增加,且由随机因素造成的变异比重加大; 从土层角度来看,同一恢复年限内,自然恢复草地基台值上层(0~20 cm)>下层(20~40 cm),块金值、块金系数则表现为上层 < 下层,下层土壤水分随机变异强于上层。重建森林的3个指标均表现为上层>下层,且表层随机性变异更大; 随恢复时间增加,森林表层土壤水分空间异质性程度加大,斑块更为破碎化,自然恢复草地0~20 cm和20~40 cm两土层变程均显著变大,土壤水分空间延续范围变大; 增加取样密度和加大研究尺度更能揭示退化红壤区土壤水分空间变异特征。

     

    Abstract: Through the classical statistics and the geological statistics method, the spatial variation patterns of soil water of rehabilitated forest and natural restoration grassland in different recovery time (15 a, 25 a) and different soil layer (0-20 cm, 20-40 cm) in the degraded red soil region, Taihe, Jiangxi Province was compared and analyzed. The results show that the soil moisture of rehabilitated forest and natural restoration grassland were uniformly distributed at the beginning. With the growing years, the soil moisture would rise and discrete degree would also increase in different extent for moderate variability. The distribution of soil moisture was the normal distribution, matched a spherical model (R2 > 0.804). The data showed the significant spatial correlation and spatial variation characteristics, which mainly came from soil parent materials, topography and other structural variation. There was a significant increase in the nugget, sill and nugget/sill. The total variation had increased and caused by random factor according to the time alignment. The sill in the 0-20 cm soil layer of natural restoration grass was higher than that in the 20-40 cm soil layer at the same year, but the nugget and nugget/sill showed the contrary, so the random variation of under layer soil moisture was stronger than upper layer. For the rehabilitated forest, the 3 indexes showed that upper soil layer higher than under layer, and the random variation in surface layer was stronger. The spatial heterogeneity of surface soil moisture in rehabilitated forest increased with the restoration years, and displayed serious fragmentation. The variation range of the 2 layers (0-20 cm and 20-40 cm) in natural restored grass significantly increased with the change of time. The increased sampling density and extend slope would reveal spatial variation characteristics of soil moisture in degraded red soil region.

     

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