丹江口水库堵河流域水源涵养林最大冠层截留量遥感估算.docVIP

 丹江口水库堵河流域水源涵养林最大冠层 截留量遥感估算# 5 10 15  摘要：水源涵养林冠层截留是对降雨的第一次截获，也是植被水分保持能力的重要指标。本 研究基于冠层截留模型和 Landsat ETM+遥感融合数据估算了丹江口水库堵河流域水源涵养 林的冠层最大截留量。研究结果表明最大冠层截留量的空间变化与植被覆盖具有很强的关 系，研究区域的最大冠层截留量表现为北部低，南部高，最大冠层截留量最大值为 3.256mm， 平均最大截留量为 0.244mm。植被类型上看，冠层最大截留量的顺序为针叶林（3.256mm） ＞混交林（1.639mm）＞灌丛（1.551mm）＞阔叶林（1.465mm）＞草地（1.291mm）。针叶林 的冠层最大截留量在 1.456-3.256mm 的部分占总比例的 55.29%，55.4%的阔叶林冠层最大截 留量为 0.654 - 1.465mm，同时针叶林的降雨截留能力强于阔叶林地。54.08%的混交林的冠 层最大截留量是 0.753-1.639mm，总体上也优于阔叶林。研究结果可为后期堵河流域水源涵 养林栽植区域和栽植结构提供一定的数据支持，同时对水源涵养林效能的评价具有现实意 义，还可为生态水文格局的合理构建和水资源的可持续利用提供理论支持。 关键词：森林植被与水土保持；丹江口水库；冠层截留；水源涵养林 中图分类号：[S719] 20 Estimating spatial patterns of maximum canopy rainfall interception of water conservation forest from remote sensing in Duhe watershed of Danjiangkou reservoir SONG Yantun, HAO Rong, CHEN Fangxin 25 30 35 40 (College of Resources and Environment, Huazhong Agricultural University, Wuhan 430070) Abstract: Canopy interception is first intercept and is important criterion of vegetation water conservation capacity. This paper, based on “HeDongjin canopy interception model” and Landsat ETM+ remote sensing fusion image estimated canopy maximum interception of water conservation forest in Duhe watershed of middle line in South-to-North water diversion project. The results indicated that spatial variability of maximum canopy interception and vegetation coverage has a strong relationship and, consequently, maximum canopy interception is low in north area and is high in southern area. Findings further revealed that canopy maximum interception in the largest value is 3.256mm and the average maximum interception is 0.244 mm. The largest value of canopy maximum interception order is coniferous forest ( 3.256mm ) mixed forest ( 1.639mm ) shrub ( 1.551mm ) hardwood forest ( 1.465mm ) grassland ( 1.291mm ). Canopy maximum interception of coniferous forest in 1.456-3.256mm components accounted for 55.29%, 55.4% of the broadleaf forest canopy maximum interception is 0.654-1.465mm, and meanwhil