【摘要】：以廣西桂林市農(nóng)業(yè)科學(xué)院大豆、甘蔗及梨樹植被覆蓋的土壤為例,研究不同土地利用模式下土壤斥水性的空間變化。通過對每個試驗區(qū)面積為135 m×105 m的100個測量點應(yīng)用滴水穿透時間法(water drop penetration time,WDPT)進(jìn)行土壤斥水性測量,利用土壤含水量確定干旱(0.062±0.025)cm~3·cm~(-3)、中等(0.151±0.045)cm~3·cm~(-3)和濕潤(0.237±0.086)cm~3·cm~(-3)的土壤水分條件。運用地統(tǒng)計方式,對土壤斥水性進(jìn)行空間變化分析。結(jié)果表明:在干旱和濕潤水分條件下,WDPT的大小均表現(xiàn)出梨樹地最大,甘蔗地次之,大豆地最小,與土壤含水量和有機質(zhì)大小的變化一致,但是在中等水分條件下,WDPT均值大豆地高于甘蔗地,同時3個試驗區(qū)的滴水入滲持續(xù)時間都達(dá)到最大。土壤斥水性的地統(tǒng)計分析結(jié)果表明,在3種水分條件下,3個試驗區(qū)的空間結(jié)構(gòu)比基本上大于75%,空間相關(guān)性較強。在土壤斥水性的高閾值空間分布上,甘蔗地的穩(wěn)定性比大豆地強,而梨樹的空間分布穩(wěn)定性最弱。研究結(jié)果說明人類的活動會對土壤斥水性空間穩(wěn)定性產(chǎn)生干擾,但土壤本身仍具有恢復(fù)其空間分布穩(wěn)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 鹵0.025) cm~ 3 cm~ (- 3), moderate (0.151 鹵0.045) cm~ 3 cm~ (- 3) and wetting (0.237 鹵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.
【作者單位】： 桂林理工大學(xué)廣西巖溶地區(qū)水污染控制與用水安全保障協(xié)同創(chuàng)新中心;桂林理工大學(xué)廣西環(huán)境污染控制理論與技術(shù)重點實驗室;桂林理工大學(xué)環(huán)境科學(xué)與工程學(xué)院;桂林市農(nóng)業(yè)科學(xué)院;
【基金】：國家自然科學(xué)基金(41501230、41301289) 廣西自然科學(xué)基金(2016GXNSFAA380197)
【分類號】：S152.7
，

本文編號：2513923