水淹条件下三峡水库消落带常见草本植物的分解

应用生态学报

水淹条件下三峡水库消落带常见草本植物的分解

袁庆叶^1,2,谢宗强¹,杨林森³,熊高明¹,李兆佳^1,2,樊大勇^1**

(¹中国科学院植物研究所植被与环境变化国家重点实验室, 北京100093; ^2中国科学院大学, 北京100049; ³湖北神农架国家级自然保护区管理局, 湖北神农架442400)

出版日期:2014-08-18 发布日期:2014-08-18

Decomposition of herbaceous species in reservoir riparian region of Three Gorges Reservoir under flooding condition.

YUAN Qing-ye^1,2, XIE Zong-qiang¹, YANG Lin-sen³, XIONG Gao-ming¹, LI Zhao-jia^1,2, FAN Da-yong^1

(¹State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; ^2University of Chinese Academy of Sciences, Beijing 100049, China; ^3Administration of Shennongjia National Nature Reserve, Shennongjia 442400, Hubei, China)

Online:2014-08-18 Published:2014-08-18

摘要/Abstract

摘要： 对三峡水库消落带10种常见的一年生和多年生草本植物进行模拟淹水试验,研究水淹条件下植物分解释放氮磷规律和分解速率与植物组织内营养元素及结构性碳水化合物含量之间的关系.结果表明: 不同物种分解速率不同,水花生的分解速率最大,分解速率常数k=0.0228 d^-1,莠竹最小,k=0.0029 d^-1,但一年生草本和多年生草本的分解速率差异不显著.一年生草本与多年生草本氮磷含量差异不显著,其中,双穗雀稗和鬼针草对水体氮磷含量影响最大;水花生氮释放能力较强,但对水体磷含量影响最小;水体中总氮、总磷含量与植物分解速率、植物体分解初始C含量、C∶N、木质素∶N呈显著负相关,与植物体K、Ca、N含量呈显著正相关.

Abstract: A total of 10 annuals and perennials of herbaceous species were investigated in reservoir riparian region of Three Gorges Reservoir. The correlations between the plants’ nutrient release rate and the substrate composition and structural matter were studied under flooding condition. The decomposition rates of different species differed substantially, with the maximum of Alternanthera philoxeroides (decomposition rate constant k=0.0228 d^-1) and the minimum of Microstegium vimineum (k=0.0029 d^-1). There was no significant difference in k between annuals and perennials. There was no significant difference in nitrogen and phosphorus contents between annuals and perennials. Paspalum paspaloides and Bidens pilosa released more nutrients into the water than the other species. A. philoxeroides had a higher potential to release nitrogen while it had little effect on water phosphorus compared with the other species. Total N, P contents in the water were negatively correlated with the plants’ decomposition rate, initial C content, C:N ratio, lignin:N ratio, and positively correlated with initial contents of K, Ca and N in plants.

袁庆叶1,2,谢宗强1,杨林森3,熊高明1,李兆佳1,2,樊大勇1**. 水淹条件下三峡水库消落带常见草本植物的分解[J]. 应用生态学报.

YUAN Qing-ye1,2, XIE Zong-qiang1, YANG Lin-sen3, XIONG Gao-ming1, LI Zhao-jia1,2, FAN Da-yong1. Decomposition of herbaceous species in reservoir riparian region of Three Gorges Reservoir under flooding condition.[J]. Chinese Journal of Applied Ecology.