岩溶地区不同土地利用方式下土壤斥水性的空间变化
发布时间：2019-07-12 19:20
【摘要】：以广西桂林市农业科学院大豆、甘蔗及梨树植被覆盖的土壤为例,研究不同土地利用模式下土壤斥水性的空间变化。通过对每个试验区面积为135 m×105 m的100个测量点应用滴水穿透时间法(water drop penetration time,WDPT)进行土壤斥水性测量,利用土壤含水量确定干旱(0.062±0.025)cm~3·cm~(-3)、中等(0.151±0.045)cm~3·cm~(-3)和湿润(0.237±0.086)cm~3·cm~(-3)的土壤水分条件。运用地统计方式,对土壤斥水性进行空间变化分析。结果表明:在干旱和湿润水分条件下,WDPT的大小均表现出梨树地最大,甘蔗地次之,大豆地最小,与土壤含水量和有机质大小的变化一致,但是在中等水分条件下,WDPT均值大豆地高于甘蔗地,同时3个试验区的滴水入渗持续时间都达到最大。土壤斥水性的地统计分析结果表明,在3种水分条件下,3个试验区的空间结构比基本上大于75%,空间相关性较强。在土壤斥水性的高阈值空间分布上,甘蔗地的稳定性比大豆地强,而梨树的空间分布稳定性最弱。研究结果说明人类的活动会对土壤斥水性空间稳定性产生干扰,但土壤本身仍具有恢复其空间分布稳定性的能力。
[Abstract]:Taking the soil covered by soybean, sugar cane and pear vegetation of Guangxi Guilin Academy of Agricultural Sciences as an example, the spatial change of soil water repellency under different land use patterns was studied. The soil water repellency was measured by drip penetration time method (water drop penetration time,WDPT) at 100 measuring points with an area of 135m 脳 105 m. The soil moisture conditions of drought (0.062 卤0.025) cm~ 3 cm~ (- 3), moderate (0.151 卤0.045) cm~ 3 cm~ (- 3) and wetting (0.237 卤0.086) cm~ 3 cm~ (- 3) were determined by soil water content. The spatial change of soil water repellency was analyzed by geostatistics. The results showed that under the condition of drought and humid moisture, the size of WDPT was the largest in pear land, the second in sugar cane land and the smallest in soybean field, which was consistent with the change of soil water content and organic matter, but under the condition of medium moisture, the mean value of WDPT in soybean field was higher than that in sugar cane field, and the drip infiltration duration of the three experimental areas reached the maximum. The results of soil water repellent statistical analysis showed that the spatial structure ratio of the three experimental areas was basically more than 75% under three kinds of water conditions, and the spatial correlation was strong. In the high threshold spatial distribution of soil water repellency, the stability of sugar cane land was stronger than that of soybean land, while the spatial distribution stability of pear tree was the weakest. The results show that human activities will interfere with the spatial stability of soil water repellency, but the soil itself still has the ability to restore the stability of its spatial distribution.
【作者单位】： 桂林理工大学广西岩溶地区水污染控制与用水安全保障协同创新中心;桂林理工大学广西环境污染控制理论与技术重点实验室;桂林理工大学环境科学与工程学院;桂林市农业科学院;
【基金】：国家自然科学基金(41501230、41301289) 广西自然科学基金(2016GXNSFAA380197)
【分类号】：S152.7
，
本文编号：2513923
[Abstract]:Taking the soil covered by soybean, sugar cane and pear vegetation of Guangxi Guilin Academy of Agricultural Sciences as an example, the spatial change of soil water repellency under different land use patterns was studied. The soil water repellency was measured by drip penetration time method (water drop penetration time,WDPT) at 100 measuring points with an area of 135m 脳 105 m. The soil moisture conditions of drought (0.062 卤0.025) cm~ 3 cm~ (- 3), moderate (0.151 卤0.045) cm~ 3 cm~ (- 3) and wetting (0.237 卤0.086) cm~ 3 cm~ (- 3) were determined by soil water content. The spatial change of soil water repellency was analyzed by geostatistics. The results showed that under the condition of drought and humid moisture, the size of WDPT was the largest in pear land, the second in sugar cane land and the smallest in soybean field, which was consistent with the change of soil water content and organic matter, but under the condition of medium moisture, the mean value of WDPT in soybean field was higher than that in sugar cane field, and the drip infiltration duration of the three experimental areas reached the maximum. The results of soil water repellent statistical analysis showed that the spatial structure ratio of the three experimental areas was basically more than 75% under three kinds of water conditions, and the spatial correlation was strong. In the high threshold spatial distribution of soil water repellency, the stability of sugar cane land was stronger than that of soybean land, while the spatial distribution stability of pear tree was the weakest. The results show that human activities will interfere with the spatial stability of soil water repellency, but the soil itself still has the ability to restore the stability of its spatial distribution.
【作者单位】： 桂林理工大学广西岩溶地区水污染控制与用水安全保障协同创新中心;桂林理工大学广西环境污染控制理论与技术重点实验室;桂林理工大学环境科学与工程学院;桂林市农业科学院;
【基金】：国家自然科学基金(41501230、41301289) 广西自然科学基金(2016GXNSFAA380197)
【分类号】：S152.7
，
本文编号：2513923
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