發(fā)布時間：2018-04-23 18:15

  本文選題：敦煌市 + 干旱區(qū)�。� 參考：《土壤通報》2017年05期

【摘要】：地處極端干旱區(qū)的敦煌市綠洲在氣候條件干旱和人類活動加劇的雙重壓迫下,土壤資源可持續(xù)發(fā)展面臨著嚴(yán)峻的挑戰(zhàn)。本研究基于實地調(diào)查數(shù)據(jù)、MODIS-NDVI和DEM數(shù)據(jù),在綜合分析土壤理化性質(zhì)的基礎(chǔ)上,選取了14項理化指標(biāo),利用最小數(shù)據(jù)集(MDS)方法,從坡向、植被覆蓋度和高程3個方面對研究區(qū)的土壤質(zhì)量進行了評價。研究結(jié)果表明:不同坡度條件下,土壤質(zhì)量為陽坡高于陰坡,而陽坡與半陽坡間,陰坡與半陰坡間差異不大;植被覆蓋度對土壤質(zhì)量影響顯著,即土壤質(zhì)量隨著植被覆蓋度增高而變好;高程對土壤質(zhì)量的影響具有兩面性,隨著海拔升高,土壤鹽分降低的同時養(yǎng)分含量也在減少;而干旱氣候?qū)е峦寥利}分偏高,含水量、有效氮和有機質(zhì)含量顯著偏低。此外,研究中基于MDS的方法,引入Norm值以避免僅用因子載荷作為唯一選擇標(biāo)準(zhǔn)而導(dǎo)致的部分因子信息被忽略的缺點,在對MDS的可靠性進行驗證顯示,相關(guān)系數(shù)檢驗說明該方法具有很好的可行性。
[Abstract]:The sustainable development of soil resources in Dunhuang oasis, which is located in the extreme arid area, is faced with severe challenges under the dual oppression of drought and intensified human activities. Based on field survey data, MODIS-NDVI and DEM data, based on the comprehensive analysis of soil physical and chemical properties, 14 physical and chemical indexes were selected. The soil quality of the study area was evaluated from three aspects of vegetation coverage and elevation. The results showed that the soil quality of sunny slope was higher than that of shady slope, but there was little difference between sunny slope and semi-sunny slope, and vegetation coverage had a significant effect on soil quality. That is, the soil quality is improved with the increase of vegetation coverage; the influence of elevation on soil quality is dual. With the increase of altitude, the soil salinity decreases and the nutrient content decreases, while the dry climate leads to higher soil salinity and higher water content. The contents of available nitrogen and organic matter were significantly lower. In addition, based on the method of MDS, the Norm value is introduced to avoid the disadvantage of ignoring some factor information caused by using factor load as the sole selection criterion, and the reliability of MDS is verified. Correlation coefficient test shows that this method is feasible.
【作者單位】： 陜西師范大學(xué)旅游與環(huán)境學(xué)院;地理學(xué)國家級實驗教學(xué)示范中心(陜西師范大學(xué));
【基金】：國家科技支撐項目《敦煌生態(tài)修復(fù)關(guān)鍵技術(shù)研究與示范》(2012BAC08B07)子課題《干湖盆植被修復(fù)技術(shù)試驗與示范》陜西師范大學(xué)中央高�；究蒲袠I(yè)務(wù)費創(chuàng)新團隊項目(GK201101002)“干旱地區(qū)生態(tài)水文研究”資助
【分類號】：S159

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