淹水对丹江口库区新增消落区土壤养分的影响
Effects of flooding on soil nutrients in new water-level-fluctuating zone of the Danjiangkou Reservoir area
王恺丽 1李潜 2李林洋 1葛乐 2陈鹏 3袁晓良 2张小全 2李志国 3刘毅3
作者信息
- 1. 中国科学院武汉植物园/水生植物与流域生态重点实验室,武汉 430074;中国科学院大学,北京 100049
- 2. 大自然保护协会北京代表处,北京 100600
- 3. 中国科学院武汉植物园/水生植物与流域生态重点实验室,武汉 430074
- 折叠
摘要
丹江口水库是南水北调中线工程的水源地,水库大坝加高引起的水位变化深刻影响库区消落区湿地生态系统功能.以丹江口库区新增消落区为研究对象,采集淹水前后消落区不同土地利用方式的土壤,探讨淹水对丹江口库区新增消落区土壤养分的影响.结果表明,淹水影响新增消落区不同土地利用方式和不同高程的土壤养分含量.淹水前,不同土地利用方式土壤综合养分指数处于Ⅰ～Ⅱ级水平,顺序依次为弃耕区＞自然恢复区＞乔木区＞灌木区＞农田区;淹水后,土壤综合养分指数提升到Ⅱ～Ⅲ级水平,其中,乔木区综合养分指数最高,依次为灌木区、农田区、自然恢复区和弃耕区.土壤综合养分指数的空间分布表明,高程和土地利用方式共同影响新增消落区土壤质量,基于自然的人工植被恢复有利于新增消落区生态功能的快速恢复,保证库区水质的安全.
Abstract
Danjiangkou Reservoir is the water source of the middle route of the South-to-North Water Transfer Pro-ject.The change of water level caused by the heightening of reservoir dam has profound impacts on ecosystem func-tion in the water-level-fluctuating zone of the reservoir area.In this study,we collected soil samples under different land use types in the new water-level-fluctuating zone before and after flooding,and examined the effects of flooding on soil nutrients.The results showed that flooding affected soil nutrient contents of different land use types across different elevations in the new water-level-fluctuating zone.Before flooding,soil comprehensive nutrient index of different land use types belonged to levels Ⅰ and Ⅱ,with an order of abandoned farmland area＞natural restoration area＞arbor area＞shrub area＞farmland area.After flooding,soil comprehensive nutrient index increased to levels Ⅱ and Ⅲ.The arbor area had the highest value,followed by shrub area,farmland area,natural restoration area,and abandoned farmland area.The spatial distribution of soil comprehensive nutrient index indicated that ele-vation and land use types affected soil quality in the new water-level-fluctuating zone.The artificial vegetation resto-ration based on nature is beneficial to the rapid restoration of ecological function of the new water-level-fluctuating zone and the safety of water quality in the reservoir area.
关键词
消落区/丹江湿地/植被恢复/土壤养分/退耕还湿Key words
water-level-fluctuating zone/Danjiang River wetland/vegetation restoration/soil nutrient/returning farmland to wetland引用本文复制引用
基金项目
国家自然科学基金项目(31971532)
大自然保护协会河南丹江项目资助()
出版年
2024
国家科技期刊平台
NSTL
万方数据