摘要
草原型河湖消落带由于其水陆的周期性交换特征,对水体碳氮磷等营养物质的输入具有重要作用。该文以呼伦湖及3条主要入湖河流消落带为采样区,采用原位土柱实验法探究了河湖消落带土壤碳氮磷的释放规律。结果表明:消落带地表覆盖对水淹状态下营养盐的释放影响较大,粪便覆盖土柱释放速率高于植被覆盖土柱,裸土土柱释放水平最低;蒸馏水对照组营养盐的总释放通量高于原位湖水组,平均释放通量为原位湖水组的1.1~1.4倍;不同类型土柱的总有机碳(TOC)、总氮(TN)、氨氮(NH_(4)^(+)-N)、总磷(TP)释放速率的变化趋势基本一致,浸泡平均释放速率大小为TOC>TN>TP>NH_(4)^(+)-N,且粪便覆盖土的释放通量约为裸土的6倍,为植被覆盖土的2倍。
Due to the periodic exchange characteristics of water and land,steppe water-level-fluctuating zone plays an important role in the input of nutrients such as carbon,nitrogen and phosphorus.In this paper,Hulun Lake and the three main rivers into the lake as the sampling area,the in situ soil column experiment was used to explore the release law of soil carbon,nitrogen and phosphorus in the river and lake fluctuating zones.Results showed that the surface cover of the water-level fluctuating zone has a greater impact on the release of nutrients in the flooded state.The release rate of the soil column covered by manure is higher than that of the soil column covered by vegetation,and the release level of the soil column covered by bare soil is the lowest.The total release flux of nutrients in the distilled water control group was higher than that of the in situ lake water group,and the average release amount was 1.1 to 1.4 times that of the in situ lake water group.The release rates of total organic carbon(TOC),total nitrogen(TN),ammonia nitrogen(NH_(4)^(+)-N),and total phosphorus(TP)of different types of soil columns are basically the same.The average release rate of TOC is the largest,followed by TN,TP and NH_(4)^(+)-N.The release flux of manure covered soil is about 6 times that of bare soil,and 2 times that of vegetation covered soil.
作者
朱南华诺娃
徐逸
王雪蕾
冯爱萍
黄莉
ZHU Nanhuanuowa;XU Yi;Wang Xuelei;FENG Aiping;HUANG Li(Satellite Application Center for Ecology and Environment,Ministry of Ecology and Environment,Beijing 100094,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2021年第7期108-114,共7页
Environmental Science & Technology
基金
国家自然科学基金面上项目(41871346)
关键词
呼伦湖
消落带
土柱实验
碳氮磷释放
Hulun Lake
water-level-fluctuating zone
soil column experiment
carbon,nitrogen and phosphorus release
