發(fā)布時(shí)間：2018-03-09 02:02

  本文選題：干濕循環(huán)　切入點(diǎn)：土壤水含量　出處：《南方農(nóng)業(yè)學(xué)報(bào)》2017年09期 　論文類(lèi)型：期刊論文

【摘要】：【目的】研究桂林喀斯特地區(qū)干濕循環(huán)過(guò)程中土壤水含量的空間分布變化,為解決該地區(qū)農(nóng)田水土流失及農(nóng)作物防旱抗旱提供理論依據(jù)�！痉椒ā窟x取種植有大豆、梨樹(shù)和甘蔗3種不同農(nóng)作物的耕作地為試驗(yàn)地,分析3種試驗(yàn)地在干濕交替條件下土壤表層0~6 cm土壤水含量的空間變異,并利用地統(tǒng)計(jì)方法研究不同土地利用方式下的土壤空間分布變異。【結(jié)果】大豆、梨樹(shù)和甘蔗3種試驗(yàn)地的土壤質(zhì)地差異不顯著(P0.05),土壤容重表現(xiàn)為梨樹(shù)地最小,但土壤有機(jī)質(zhì)含量和總孔隙度均以梨樹(shù)地最高。3種試驗(yàn)地濕潤(rùn)階段的土壤水含量是干旱階段土壤水含量的2~3倍。在整個(gè)干旱—濕潤(rùn)循環(huán)過(guò)程中,3種試驗(yàn)地的土壤水含量均表現(xiàn)為梨樹(shù)地甘蔗地大豆地,土壤水含量空間分布比為37.18%~95.99%,呈中等偏上的空間相關(guān)性,說(shuō)明試驗(yàn)地的空間分布在一定范圍內(nèi)表現(xiàn)穩(wěn)定,但因不同的土地利用方式存在一定變異性,變異強(qiáng)度也因其耕作方式或管理方式的不同而異�！窘Y(jié)論】桂林喀斯特地區(qū)土壤自身具有維持其土壤水含量空間分布穩(wěn)定的能力,但耕作方式、灌溉等人為因素在一定程度上會(huì)削弱土壤水含量的空間穩(wěn)定性。
[Abstract]:[objective] to study the spatial distribution of soil water content during dry and wet cycle in karst area of Guilin, so as to provide a theoretical basis for solving soil erosion and drought prevention and drought resistance of crops in this area. [methods] Soybean was planted. The cultivated land of three different crops, pear tree and sugarcane, was used to study the spatial variation of soil water content in 0 ~ 6 cm soil under the condition of alternate dry and wet. The spatial distribution and variation of soil under different land use patterns were studied by means of geostatistics. [results] the soil texture of soybean, pear and sugarcane was not significantly different, but the soil bulk density was the smallest. However, the soil organic matter content and total porosity of the soil were the highest in the pear tree field. 3. 3. The soil water content in the wetting stage was 2 ~ 3 times higher than that in the drought stage. During the whole arid-humid cycle, the soil water content of the three experimental plots was 3 times. The water content in the sugarcane field of pear tree field is soybean field, The spatial distribution ratio of soil water content was 37.18% and 95.99m, which showed a moderate spatial correlation, which indicated that the spatial distribution of the experimental land was stable in a certain range, but there was some variability in different land use patterns. [conclusion] the soil in karst area of Guilin has the ability to maintain stable spatial distribution of soil water content. Artificial factors such as irrigation will weaken the spatial stability of soil water content to some extent.
【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(diǎn)實(shí)驗(yàn)室;廣西農(nóng)業(yè)科學(xué)院微生物研究所;桂林市農(nóng)業(yè)科學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(41501230,31360356) 廣西自然科學(xué)基金項(xiàng)目(2016GXNSFAA380197) 廣西中青年教師基礎(chǔ)能力提升項(xiàng)目(2017KY0270)
【分類(lèi)號(hào)】：S152.7

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