南水北调与水利科技Issue(4)：609-613,5.DOI:10.13476/j.cnki.nsbdqk.2015.04.001
额济纳三角洲土地利用现状及其蒸散发量时空分异特征
Current land use situation and characteristics of temporal and spatial distribution of its evapotranspiration in the Ejina Delta
摘要
Abstract
The land use was reclassified based on the evapotranspiration ( ET ) and land use dat a in 2010 obtained f rom remot e sensing retrievals in the H eihe Watershed, the ET data w ere resampled using the nearest neighbors mEThod, t he monthly and yearly ET of each land use w ere calculated, and the charact eristics of its temporal and spatial distribut ion were finally analyzed. The results showed t hat ( 1) the remote sensing analysis area of Ejina Delta is 8 073. 6 km2 ; ( 2) according t o the characterist ics of moist ure dissipation and recharge, the land use can be reclassified into water, farmland, bare land, construction land, and for-est-oasis land, and the order of annual E T in each land use t ype in 2010 is water ( 815. 9 mm) > farmland ( 142. 8 mm) > for-est-oasis land ( 103. 3 mm) > construction land ( 61. 6 mm) > bare land ( 55. 6 mm) ; ( 3) the total ET of Ejina Delta is 5. 39× 108 m3 in 2010, and the ET of bare land, forest-oasis land, and water accounts for 71. 6% , 18. 5% , and 6. 9% of the total E T, re-spect ively; ( 4) the maximum monthly ET of w ater, farmland, bare land, construction land, and forest-oasis land occurs in June, August, June, June, and June, respect ively, w hile t he minimum occurs in November, January, January, January, and January, re-spect ively. The ration of maximum and minimum extreme values is 223. 5 ( farmland) and 43. 5 ( w ater) ; ( 5) the total ET from June t o September accounts f rom 61. 3% ( water) to 83. 9% ( farmland) , while the total ET from November to March of next year accounts from 2. 7% ( farmland) to 7. 7% ( w ater) of the annual E T; and ( 6) the spatial variability of ET of one land use type is remarkable. The maximum of extremes ratio, standard deviat ion, and coefficient of variation of pixel of all land use types are 30. 3 ( w ater) , 511. 5 ( w ater) , 0. 63 ( w ater) , respectively, indicating that the spatial variability of annual ET for land use type of w ater is the greatest.关键词
额济纳三角洲/土地利用现状/蒸散发/水分耗散和补给特征/时空分异特征Key words
Ejina Delta/current land use situat ion/evapotranspirat ion/feature of moist ure dissipat ion and recharge/characteris-tics of temporal and spatial variability分类
天文与地球科学引用本文复制引用
刘啸,张一驰,杜朝阳,于静洁..额济纳三角洲土地利用现状及其蒸散发量时空分异特征[J].南水北调与水利科技,2015,(4):609-613,5.基金项目
国家自然科学基金项目(41271049,41371059) （41271049,41371059）
