發(fā)布時(shí)間：2018-01-09 03:24

  本文關(guān)鍵詞：干濕交替對(duì)干熱河谷沖溝發(fā)育區(qū)不同土壤崩解性的影響　出處：《水土保持學(xué)報(bào)》2016年02期 　論文類型：期刊論文

  更多相關(guān)文章： 干濕交替 土壤崩解性 干熱河谷

【摘要】：通過選取干熱河谷區(qū)典型發(fā)育的3種原位土壤(燥紅土、變性土和新積土)剖面平臺(tái),采用"澆水—曝曬"循環(huán)的方法模擬研究區(qū)干濕交替的氣候條件,設(shè)置0,1,3,5次干濕交替頻度,以探明不同干濕交替處理對(duì)干熱河谷沖溝發(fā)育區(qū)3種典型土壤的崩解性差異及其影響因素。結(jié)果表明:(1)3種土壤的崩解過程有所差異,燥紅土崩解速度較慢,崩解持續(xù)時(shí)間短,崩解殘留土較多;變性土崩解速度極慢,崩解持續(xù)時(shí)間長,崩解殘留土量最多;新積土崩解過程迅速,土壤崩解速度極快,幾乎無殘留土量。(2)3種土壤的崩解性差異明顯,最大崩解指數(shù)從大到小依次為新積土(97.56%)變性土(38.67%)燥紅土(12.92%);平均崩解速率表現(xiàn)出相似結(jié)果。(3)干濕交替對(duì)3種土壤崩解性均有一定增強(qiáng)作用,對(duì)燥紅土和變性土崩解性增強(qiáng)作用主要表現(xiàn)為提高其最大崩解指數(shù)和增大其崩解速率2個(gè)方面,而對(duì)新積土崩解性的影響則主要表現(xiàn)為縮短其崩解完成所需時(shí)間。研究結(jié)果從干濕交替的角度為沖溝土壤的崩解性研究提供一定的理論參考,為認(rèn)知該區(qū)水土作用過程及開展水土保持工作奠定理論基礎(chǔ)。
[Abstract]:Through selecting three kinds of typical in situ soil (dry red soil, denatured soil and newly deposited soil) profile platform developed in dry and hot valley area, the climatic conditions of dry and wet alternation in the study area were simulated by the method of "pouring-exposure" cycle. The frequency of 5 times of dry and wet alternation is set up. The disintegrating characteristics of three typical soils in dry and hot valley gully development area and their influencing factors were found to be different under different dry-wet alternate treatments. The results showed that there were differences in the disintegration process of three kinds of soils in the dry and hot valley gully development area. Dryness red soil disintegrating speed is slower, disintegrating time is short, disintegrating residual soil is more; The rate of decomposition of denatured soil is very slow, the time of disintegration is long, and the amount of residual soil is the most. The process of new soil disintegration is rapid, the rate of soil disintegration is extremely fast, and there is no residual soil quantity. The disintegrating properties of three kinds of soils are obviously different. The largest disintegrating index from big to small is the newly deposited soil (97.56)) the denatured soil (38.67) the dry red soil (12.92%); The average disintegration rate showed a similar result. 3) the dry and wet alternation had a certain enhancement effect on the disintegration of three kinds of soil. For dryness red soil and denatured soil, the enhancement of disintegration was mainly manifested in two aspects: increasing its maximum disintegration index and increasing its disintegration rate. The effect on the disintegration of neo-soil is mainly to shorten the time needed to complete the disintegration. The results provide a theoretical reference for the study of soil disintegration in gully from the angle of dry-wet alternation. It lays a theoretical foundation for understanding the process of soil and water action and carrying out the work of soil and water conservation in this area.
【作者單位】： 中國科學(xué)院山地災(zāi)害與地表過程重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院水利部成都山地災(zāi)害與環(huán)境研究所;中國科學(xué)院大學(xué);
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2015CB452704) 國家自然科學(xué)基金項(xiàng)目(41571277) 中國科學(xué)院“西部之光”重點(diǎn)項(xiàng)目(Y4R2060060) 2015年度四川省學(xué)術(shù)和技術(shù)帶頭人培養(yǎng)資金資助項(xiàng)目
【分類號(hào)】：S157.1
【正文快照】： 土壤崩解,又稱濕化,是指土壤在靜水中發(fā)生分散、碎裂、塌落或強(qiáng)度減弱的現(xiàn)象[1],在降雨作用的土壤侵蝕過程中,崩解是侵蝕發(fā)生的先決條件。它是研究土壤侵蝕機(jī)理的途徑之一,也是從土壤水理性質(zhì)角度評(píng)價(jià)土壤抗侵蝕性能的一項(xiàng)重要指標(biāo)[1]。已有研究表明土壤崩解直接受土壤結(jié)構(gòu)[2]

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 崔豐明;造粒鈣鎂磷肥崩解性試驗(yàn)研究[J];化肥設(shè)計(jì);2005年03期

，

本文編號(hào)：1399829