首页关于本刊影响因子及获奖投稿须知订阅及广告专辑与专题学术会议绿色发表通道优秀论文 
说明:
此论文已被《生态学报》录用,现已优先出版,可查看文章PDF版本!
宫兆宁,陈雨竹.近35年官厅水库消落带的消涨特征及分区研究.生态学报,2017,(16).http://dx.doi.org/10.5846/stxb201605190968  
近35年官厅水库消落带的消涨特征及分区研究
Fluctuation Characteristics and Subzone Analysis of Hydro-fluctuation belt in Guanting Reservoir during 1979-2013
投稿时间:2016-05-19  修订日期:2017-03-08
DOI: 10.5846/stxb201605190968
关键词水位变化  消落带分区  射线法  叠置分析法  官厅水库  
Key Wordswater level fluctuation  subzone in hydro-fluctuation belt  transect sample analysis  overlay analysis  Guanting Reservoir.
基金项目国家国际科技合作专项项目International S&T Cooperation Program of China (2014DFA21620)
作者单位E-mail
宫兆宁 首都师范大学资源环境与旅游学院 gongzhn@163.com 
陈雨竹 首都师范大学资源环境与旅游学院  
摘要点击次数 128
全文下载次数 22
摘要:
水库消落带作为重要的生态交错过渡带,是深入分析生态要素内在作用机制的特殊区域。本文以华北内陆大型水库——官厅水库为研究对象,选择1979-2013年Landsat MSS/TM/ETM /OLI影像作为数据源,分析35年来官厅水库消落带的消涨特征、时空分布差异及其变化趋势,在此基础上进行消落带淹水时长和淹水频次的分区研究,揭示消落带生态结构的形成过程。研究结论如下:(1)近35年来,官厅水库水位落差较大,达8.19m,水位变化分为3个特征时期:1979-1996年,涨落周期约为4-5年的间歇涨落期;1996-2007年,水位持续下降达7.12m的持续萎缩期;2007-2013年,涨落周期为2年且年际变化差稳定在0.75m的频繁涨落期。(2)35年来,官厅水库水位消涨形成118.31km2的消落带,对应3个特征时期形成消落带的面积依次为80.20km2,76.81 km2和19.89 km2。间歇涨落期形成的消落带受入库水量及地形影响,主要分布在永定河河口及平坦的康西草原一带;持续萎缩期水库消落带有明显向西北河岸带扩张的趋势;频繁涨落期的消落带以库心区域水位回升为主,面积仅19.89 km2。(3)1979-2013年,基于淹水累计时长的分区中,消落带整体上表现为淹水累计时长随边岸向库区中心逐渐递增的趋势,25.85%的消落带淹水时长不足5年,71.77%的消落带淹水时长大于16年,但随着淹水时长减少,消落带区域植物旱化现象突出,同时植被群落盖度和多样性降低。淹水频次分区中,相同淹水频次的区域在空间上离散分布,一次淹水区面积为32.79km2,在消落带中所占比例优势明显,但累计淹水时长差异明显,分别为2年和26年,淹水最为频繁的消落带共经历了9次淹水过程;分区中的土壤有机质含量差异表明,淹水频次越高越有利于土壤有机质的积淀。
Abstract:
As an important transition ecozone, hydro-fluctuation belt is known to be the key area to find the function mechanism between all kinds of ecological factors. We take Guanting Reservoir, a large inland reservoir in North China, as the research area. Based on the monthly and annual water level statistic characteristic during 1979-2013, and synchronous Landsat MSS/ TM/ ETM / OLI image acquired in wet and dry season, firstly we analyzed the spatial and temporal distribution characteristics and its variation trend.Then based on the water level fluctuation history, using transect sample and overlay analysis, we quantitatively discussed the flooding frequency and duration in hydro-fluctuation belt; Based on the flooding times and years we explored subzone in hydro-fluctuation zone.It was found that:: (1) During 1979-2013, the water level of Guanting Reservoir dropped greatly, up to 8.19m. The changing process of hydro-fluctuation belt could be divided into three stage: the intermittent fluctuation period during 1979-1996 with a 4-5 years’ fluctuation cycle; the shrinking period from 1996 to 2007, whose water level continuously dropped 7.12m; and the frequent fluctuation period during 2007-2013 with two years’ fluctuation cycle and its inter-annual water level variety range was about 0.75m. (2) In recent 35 years, 118.31km2 area of hydro-fluctuation belt was formed because of water level fluctuation. The areas formed during the three characteristic periods were 80.20km2, 76.81 km2 and 19.89 km2 respectively. The hydro-fluctuation belt formed during intermittent fluctuation period was located in the Yongding River Estuary and the flat Kangxi prairie influenced by inflow water and terrain. During shrinking period, hydro-fluctuation belt shown an obvious trend of extension to the northwest riparian zone. And the hydro-fluctuation belt was formed by water level rising during frequent fluctuation period. (3) From 1979 to 2013, 25.85% riparian flooded duration less than 5 years, and 71.77% riparian flooded duration greater than 16 years, which shown obvious wetland characteristics in Guanting Reservoir. At the same time, with the decrease of flooding time, the drought phenomenon of plant was outstanding and the community coverage and diversity decreased. In the partition of flood frequency, region with same flood frequency discretely distributed in space. Moreover, differences of soil organic matter content in subzones showed that higher flooding frequency conduced to more precipitation of regional soil organic matter content.
HTML 查看全文   查看/发表评论  下载PDF阅读器

您是本站第 63366939 位访问者

Copyright © 2005-2019   京ICP备06018880号
地址:北京海淀区双清路18号
  邮编:100085    电话:010-62941099
  E-mail : shengtaixuebao@rcees.ac.cn
本系统由北京勤云科技发展有限公司提供技术支持