南京林业大学学报（自然科学版）2017，Vol.41Issue(3)：7-14,8.DOI:10.3969/j.issn.1000-2006.201702013
伊犁河上游典型草地生态系统氮磷含量及化学计量特征
Stoichiometry of nitrogen and phosphorus and the content in grassland ecosystem in the upper reaches of Hi River
摘要
Abstract
[Objective] To identify the nutrient limitation of typical grassland in the upper reaches of Ili River on the basis of stoichiometry characteristics of nitrogen (N) and phosphorus (P) in grassland ecosystem,which provides theoretical basis for nutrient cycling and plant-soil nutrient management of different grassland communities and scientific basis for the improvement of ecological environment in this area.[Method] Combined field investigation and laboratory analysis,the ecological stoichiometry of nitrogen and phosphorus contents in plants and soils from the typical grassland ecosystems were obtained.[Result] The results showed that the contents of N,P and K with above ground plant and under ground root varied greatly.The N contents of above ground followed an order as:mountain meadow and steppe alpine meadow ＞ desert steppe,semi-desert steppe and alpine meadows;the order of N contents of plant underground roots were semi-desert steppe and desert steppe ＞ mountain meadow steppe,mountain and alpine meadow.Different types of grassland ecosystems in plant above-ground P contents had a significantly negative correlation with the N/P ratio of plant.The soil N and soil P contents,soil P contents and soil N/P ratio had a significantly positive correlation.The soil N content was positively correlated with the soil N/P ratio with a correlation coefficient of 0.983.[Conclusion] The soil lacked N in the study area.It is suggested appropriately to add N fertilizer for improving the grassland productivities.关键词
草地生态系统/化学计量特征/土壤氮磷/植物氮磷/伊犁河谷Key words
grassland ecosystem/stoichiometric characteristics/soil nitrogen and phosphorus/plant nitrogen phosphorus/Ili River Valley分类
农业科技引用本文复制引用
马杰,李兰海,刘翔,白磊,高利伟,朱咏莉..伊犁河上游典型草地生态系统氮磷含量及化学计量特征[J].南京林业大学学报（自然科学版）,2017,41(3):7-14,8.基金项目
国家自然科学基金项目(41471191,41375149) （41471191,41375149）
江苏省“青蓝工程”资助项目(苏教师[2016] 15号) （苏教师[2016] 15号）
江苏高校优势学科建设工程资助项目(PAPD) （PAPD）
