生态环境学报
生態環境學報
생태배경학보
Ecology and Environment Sciences
2015年
8期
1295-1301
,共7页
土壤养分%分布特征%温度%降水%三江源
土壤養分%分佈特徵%溫度%降水%三江源
토양양분%분포특정%온도%강수%삼강원
soil nutrient%distribution pattern%temperature%precipitation%Three River Source
选择三江源地区22个高寒草甸样地进行土壤分层(0~10,10~20,20~30 cm)取样,测定土壤的pH值、有机碳(Total organic carbon,TOC)、全氮(Total nitrogen,TN)、速效氮(Available N)、全磷(Total phosphorus,TP)和速效磷(Available P,AP),并与年均温(Mean annual temperature,MAT)和年降水量(Mean annual precipitation,MAP)进行相关分析.结果表明:在研究区域,从西北向东南pH值依次降低,而土壤养分中的有机碳、全氮和速效氮的分布特征则相反.随着土壤深度的增加,pH值先保持不变后稍微增大,土壤各养分含量呈减少趋势,其中10~20和20~30 cm土壤中的全氮含量分别为3.85,3.40 g·kg-1,速效磷含量分别为3.67和3.90 mg·kg-1,即全氮和速效磷含量在深层土壤中变化幅度不大.在对温度降水响应方面,有机碳、全氮和全磷,对年降水量比年平均温度更敏感,呈现显著的正相关关系;土壤pH值与年降水量呈显著的负相关关系;土壤pH值和大部分养分在浅层土壤比深层土壤对温度降水的灵敏度大,然而速效磷与年均温的负相关关系在20~30 cm(-0.617,P<0.01)土壤中大于0~10 cm(-0.509,P<0.05)、10~20 cm(-0.521,P<0.05)土壤.
選擇三江源地區22箇高寒草甸樣地進行土壤分層(0~10,10~20,20~30 cm)取樣,測定土壤的pH值、有機碳(Total organic carbon,TOC)、全氮(Total nitrogen,TN)、速效氮(Available N)、全燐(Total phosphorus,TP)和速效燐(Available P,AP),併與年均溫(Mean annual temperature,MAT)和年降水量(Mean annual precipitation,MAP)進行相關分析.結果錶明:在研究區域,從西北嚮東南pH值依次降低,而土壤養分中的有機碳、全氮和速效氮的分佈特徵則相反.隨著土壤深度的增加,pH值先保持不變後稍微增大,土壤各養分含量呈減少趨勢,其中10~20和20~30 cm土壤中的全氮含量分彆為3.85,3.40 g·kg-1,速效燐含量分彆為3.67和3.90 mg·kg-1,即全氮和速效燐含量在深層土壤中變化幅度不大.在對溫度降水響應方麵,有機碳、全氮和全燐,對年降水量比年平均溫度更敏感,呈現顯著的正相關關繫;土壤pH值與年降水量呈顯著的負相關關繫;土壤pH值和大部分養分在淺層土壤比深層土壤對溫度降水的靈敏度大,然而速效燐與年均溫的負相關關繫在20~30 cm(-0.617,P<0.01)土壤中大于0~10 cm(-0.509,P<0.05)、10~20 cm(-0.521,P<0.05)土壤.
선택삼강원지구22개고한초전양지진행토양분층(0~10,10~20,20~30 cm)취양,측정토양적pH치、유궤탄(Total organic carbon,TOC)、전담(Total nitrogen,TN)、속효담(Available N)、전린(Total phosphorus,TP)화속효린(Available P,AP),병여년균온(Mean annual temperature,MAT)화년강수량(Mean annual precipitation,MAP)진행상관분석.결과표명:재연구구역,종서북향동남pH치의차강저,이토양양분중적유궤탄、전담화속효담적분포특정칙상반.수착토양심도적증가,pH치선보지불변후초미증대,토양각양분함량정감소추세,기중10~20화20~30 cm토양중적전담함량분별위3.85,3.40 g·kg-1,속효린함량분별위3.67화3.90 mg·kg-1,즉전담화속효린함량재심층토양중변화폭도불대.재대온도강수향응방면,유궤탄、전담화전린,대년강수량비년평균온도경민감,정현현저적정상관관계;토양pH치여년강수량정현저적부상관관계;토양pH치화대부분양분재천층토양비심층토양대온도강수적령민도대,연이속효린여년균온적부상관관계재20~30 cm(-0.617,P<0.01)토양중대우0~10 cm(-0.509,P<0.05)、10~20 cm(-0.521,P<0.05)토양.
Twenty-two sites in alpine meadow were chosen to determined the spatial pattern of the soil pH, total organic C (TOC), total N (TN), total P (TP), available N (AN)and available P (AP), Three River Source. We explored the correlation relationships between soil nutrient content and mean annual temperature (MAT), mean annual precipitation (MAP). The results indicated that the pH decreased gradually, but the characteristic of distribution of TOC, TN and AN was increased from northwest to southeast. pH was increased slightly with the increased of soil depth. However, the content of soil nutrients was decreased. In the soil depths of 10~20 cm and 20~30 cm, the content of TN was 3.85 g·kg-1, 3.40 g·kg-1 and the content of AP was 3.67 mg·kg-1, 3.90 mg·kg-1 respectively. In terms of the response to MAT and MAP, the TOC, AN, AP were more sensitive to MAP than MAT which have a significant positive correlation; on the other hand, the pH has a significant negative correlation with MAP. Besides, the sensitivity of pH and mostly soil nutrients to MAT and MAP was higher in shallow soil than the deeper soil depths, but the negative relationship between AP and MAT was higher in 20~30 cm (-0.617,P<0.01) than that in 0~10 cm (-0.509,P<0.05) and 10~20cm (-0.521,P<0.05) soil depth.
