CAJ | 학술논문

以拉萨河下游半干旱区亚高山带灌草交错区为研究区域,分别对其南、北坡的灌丛、灌草和草地土壤养分含量进行对比分析。结果表明,土壤 pH 值在6.6~8.5,总体呈中性偏弱碱性,适宜中性和弱碱性植物生长,南、北坡灌丛及南坡草地的土壤 pH 值与土层深度均可用二次函数拟合。土壤有机质含量在15.15~43.74 g / kg,南坡0~40 cm 土层土壤有机质平均含量表现为草地>灌草>灌丛,北坡表现为灌草>灌丛>草地；南、北坡灌丛和草地及北坡灌草的土壤有机质含量与土层深度均呈显著负相关,且符合二次函数关系。土壤全氮含量在0.72~2.15 g / kg,南坡土壤全氮含量表现为草地>灌草>灌丛,北坡表现为灌丛>灌草>草地；南、北坡灌丛及南坡灌草土壤全氮含量与土层深度呈显著负相关,且符合二次函数关系；南、北坡草地土壤全氮含量与土层深度无显著相关性。土壤全磷含量在0.22~0.54 g / kg,南坡土壤全磷含量表现为草地=灌草>灌丛,北坡表现为灌丛>草地>灌草；南坡灌草土壤全磷含量与土层深度无显著相关性,而北坡则呈显著正相关,且南、北坡灌草全磷含量与土层深度均可用二次函数拟合。土壤全钾含量在2.70~4.59 g / kg,南坡全钾含量表现为草地>灌草>灌丛,北坡表现为灌草>草地>灌丛,且南、北坡灌丛、灌草和草地的土壤全钾含量与土层深度均无显著相关性,南、北坡灌丛土壤全钾含量与土层深度的关系都可用二次函数拟合。总体上,南、北坡的土壤养分含量有明显差异,其中南坡灌丛和灌草的土壤有机质、全氮、全磷和全钾含量都低于北坡；对于草地,除南坡土壤全磷含量低于北坡外,其余养分含量均为南坡高于北坡。
이랍살하하유반간한구아고산대관초교착구위연구구역,분별대기남、북파적관총、관초화초지토양양분함량진행대비분석。결과표명,토양 pH 치재6.6~8.5,총체정중성편약감성,괄의중성화약감성식물생장,남、북파관총급남파초지적토양 pH 치여토층심도균가용이차함수의합。토양유궤질함량재15.15~43.74 g / kg,남파0~40 cm 토층토양유궤질평균함량표현위초지>관초>관총,북파표현위관초>관총>초지；남、북파관총화초지급북파관초적토양유궤질함량여토층심도균정현저부상관,차부합이차함수관계。토양전담함량재0.72~2.15 g / kg,남파토양전담함량표현위초지>관초>관총,북파표현위관총>관초>초지；남、북파관총급남파관초토양전담함량여토층심도정현저부상관,차부합이차함수관계；남、북파초지토양전담함량여토층심도무현저상관성。토양전린함량재0.22~0.54 g / kg,남파토양전린함량표현위초지=관초>관총,북파표현위관총>초지>관초；남파관초토양전린함량여토층심도무현저상관성,이북파칙정현저정상관,차남、북파관초전린함량여토층심도균가용이차함수의합。토양전갑함량재2.70~4.59 g / kg,남파전갑함량표현위초지>관초>관총,북파표현위관초>초지>관총,차남、북파관총、관초화초지적토양전갑함량여토층심도균무현저상관성,남、북파관총토양전갑함량여토층심도적관계도가용이차함수의합。총체상,남、북파적토양양분함량유명현차이,기중남파관총화관초적토양유궤질、전담、전린화전갑함량도저우북파；대우초지,제남파토양전린함량저우북파외,기여양분함량균위남파고우북파。
The ecotone of shrub and herbaceous plant in the subalpine zone of semi-arid region of the downstream of Lhasa River was used as the survey region,and the nutrient contents of the soil collected from the shrub, shrub-grass and grass land in both the southern and the northern slopes. The results showed that the pH value of the soil was between 6. 6 and 8. 5,which was neutral and slightly alkaline and suitable for the growth of neutral and slightly alkaline plants,and the relations between the soil pH values of shrub land in the sourthern and northern slope,grass land in the sourthern slope and the soil depth could be fitted by the quadratic function. The soil organic content was between 15. 15 g / kg and 43. 74 g / kg,the order of average content of organic matters in the soil layer of 0—40 cm was grass land >shrub-grass land > shrub land in the southern slope and shrub-grass land > shrub land > grass land in the northern slope,and the relations between the soil organic content of shrubs and grass lands in the southern and northern slopes,shrub-grass land in the northern slope and the soil depth could be fitted by quadratic function. The total nitrogen content of soil was 0. 72—2. 15 g / kg,the orders of total nitrogen content in the southern slope and the northern slope were grass land > shrub-grass land > shrub land and shrub land >shrub-grass land > grass land respectively,and the total nitrogen content of shrub land in the southern and northern slopes,shrub-grass land in the southern slope,were apparently negatively correlated with the soil depth,the relations between them conformed to the quadratic function. However,there was no apparent correlation between total nitrogen content of grass land in the southern and northern slopes and the soil depth. The total phosphorus content of the soil was 0. 22—0. 54 g / kg,the orders of total phosphorus con-tents in the southern slope and northern slope were grass land = shrub-grass land > shrub land and shrub land > grass land > shrub-grass land respectively. The total phosphorus content of shrub-grass land had no apparent correlation with the soil depth in the southern slope,while which had apparently positive correla-tion with soil depth in the northern slope,and the relations between total phosphorus contents of shrub-grass land in the southern and northern slopes and the soil depth could be fitted by the quadratic func-tion. The total potassium content of soil was 2. 70—4. 59 g / kg,the orders of total potassium contents in the southern and northern slopes were grass land > shrub-grass land > shrub land and shrub-grass land >grass land > shrub land respectively. The total potassium contents of shrub,shrub-grass and grass lands had no apparent correlations with the soil depth in the southern and northern slopes. It was suitable to use the quadratic function to fit the relationship between total potassium contents of the shrub land in the southern and northern slopes and the soil depth. Generally,soil nutrient contents were apparent different between the southern slope and the northern slope; the contents of organic matters,total nitrogen,total phosphorous and total potassium of the shrub land and shrub-grass land in the southern slope were lower than that in the northern slope; with respect to the grass land,the contents of all nutrients except total phosphorous in the southern slope was higher than that in the northern slope.