CAJ | 학술논문

在内蒙古温带草原围封、放牧和割草3种不同利用方式下，测定了大针茅、冷蒿和羊草3种优势种植物的化学计量元素，探讨了草地不同利用方式下优势种植物的化学计量特征响应机制。结果表明，3种优势种植物的 C、N、P 含量及其计量比在不同利用方式下均有明显的季节变化；不同利用方式、不同物种以及二者的交互作用均对N、P 含量及 C∶N、C∶P 和 N∶P 有显著的影响，其中，C 含量比较稳定，不同的利用方式对其无显著影响，N 含量在整个生长季内总体呈下降趋势，放牧样地3种植物叶片的 N、P 含量均高于割草和围封样地，说明放牧增加了植物 N、P 的含量。植物生长普遍受到 N 的限制，土壤养分特征在不同利用方式间也存在一定的差异，围封样地表现为更加缺 N，而放牧样地更加缺 P。放牧样地有机质、C、N 和 P 含量均高于割草和围封样地，说明适度放牧能提高土壤养分的含量，有利于植物的生长。
재내몽고온대초원위봉、방목화할초3충불동이용방식하，측정료대침모、랭호화양초3충우세충식물적화학계량원소，탐토료초지불동이용방식하우세충식물적화학계량특정향응궤제。결과표명，3충우세충식물적 C、N、P 함량급기계량비재불동이용방식하균유명현적계절변화；불동이용방식、불동물충이급이자적교호작용균대N、P 함량급 C∶N、C∶P 화 N∶P 유현저적영향，기중，C 함량비교은정，불동적이용방식대기무현저영향，N 함량재정개생장계내총체정하강추세，방목양지3충식물협편적 N、P 함량균고우할초화위봉양지，설명방목증가료식물 N、P 적함량。식물생장보편수도 N 적한제，토양양분특정재불동이용방식간야존재일정적차이，위봉양지표현위경가결 N，이방목양지경가결 P。방목양지유궤질、C、N 화 P 함량균고우할초화위봉양지，설명괄도방목능제고토양양분적함량，유리우식물적생장。
The stoichiometric elements of three dominant species,namely Stipa grandis ,Artemisia frigida and Leymus chinensis were measured in different land use (grazing-exclusion,grazing and mowing)in the tem-perate grassland in Inner Mongolia.The seasonal variations of stoichiometric characteristic of plants and soil under different grassland uses were discussed.The stoichiometric characteristic response mechanisms of the plants and the nutrient limiting conditions were analyzed.The results show that obvious seasonal variations in C,N,P concentrations and their mass ratio of the three species exist in each grassland use type.Grassland use type,species and their interactions have significant impacts on N,P concentrations and the ratios C∶N,C∶P and N∶P,among which C concentration is relatively stable in the whole growing season and different uses show no significant impact on it.N concentration reduces overall.N and P concentrations in leaves are higher in grazing plot than those in grazing-exclusion and mowing plots.It shows that grazing can increased N and P concentrations.On the whole,plant growth is limited by N.Characteristics of soil nutrients among different grassland uses have certain differences,where comparably more serious N deficiency happens in the enclosed plot and P deficiency in the grazing plot.Generally the organic matter,C,N and P concentrations in the graz-ing plot are higher than those in the mowing and enclosed plots.It shows that soil nutrients can be increased which can promote plants growth in grazing plot.