摘要
祁连山北坡中山带森林灰褐土是生长青海云杉的集中地带。选择排露沟流域海拔2 900~3 300 m的青海云杉林为研究对象,每隔100 m海拔梯度设置3个调查样地,研究青海结果表明：①在海拔梯度上,0~40 cm土层土壤有机质、全氮及全磷平均含量高海拔处高于低海拔,而且高海拔与低海拔差异显著（P〈0.05）;土壤全钾和速效钾含量则是高海拔低于低海拔,差异亦显著（P〈0.05）;速效磷含量随海拔升高没有明显的变化规律,而且海拔间差异不显著（P〉0.05）;土壤pH随海拔的升高不断减小,但是海拔间的差异不显著（P〉0.05）。②在不同土层深度,0~10 cm土层土壤有机质、全氮、全磷、速效磷和速效钾平均含量均大于10~20 cm和20~40 cm土层,而且0~10 cm土层含量显著大于20~40 cm土层（P〈0.05）;土壤pH和全钾含量则随土层深度增加,pH在0~10 cm土层与20~40 cm差异显著（P〈0.05）,但全钾含量在不同土层差异均不显著（P〉0.05）。③在碳、氮、磷、钾营养元素循环中,土壤pH和土壤有机质是影响青海云杉群落养分供应的首要限制因子。
Forest gray-brown soil is distributed in an area where Picea crassifolia grows in the mid-mountain zone of northern slope of the Qilian Mountains. In this study,P. crassifolia forests at altitudes of 2 900- 3 000 m. in the Pailugou Drainage Basin in the Qilian Mountains were selected as the research objects,and 3 sample plots were designed every 100 m altitude gradient. Soil nutrient content and pH value under P. crassifolia forest at different altitudes and different soil depths were measured,and their relationship were researcehd. The results were as follows：（ 1） In the altitude gradient,the average contents of organic matter,total nitrogen and total phosphorus in soil layer of 0- 40 cm at high altitude were higher than those at low altitude,and the difference was significant（ P ＆lt;0. 05）. However,the contents of soil total potassium and available potassium at high altitude was lower than those at low altitude,and the difference was also significant（ P ＆lt; 0. 05）. There was no obvious change of available phosphorus content with the increase of altitude,and the difference was not significant（ P ＆gt; 0. 05）. Soil pH value was decreased with the increase of altitude,and the difference was not significant neither（ P ＆gt; 0. 05）;（ 2） In different soil depths,the average contents of organic matter,total nitrogen,total phosphorus,available phosphorus and available potassium in soil layer of 0- 10 cm were higher than those in soil layers of 10- 20 cm and 20- 40cm,and those in soil layer of 0- 10 cm were significantly higher than those in soil layer of 20- 40 cm（ P ＆lt;0. 05）. Soil pH value and total potassium content were increased with the increase of soil depth,the pH value difference between soil layers of 0- 10 cm and 20- 40 cm was significant（ P ＆lt; 0. 05）,but the difference of total potassium content among different soil layers was not significant（ P ＆gt; 0. 05）;（ 3） The correlation analysis of different soil nutrients and pH value revealed that the soil
出处
《干旱区研究》
CSCD
北大核心
2013年第6期1013-1020,共8页
Arid Zone Research
基金
林业公益性行业科研专项(201104009-08)
国家自然科学基金项目(31260141)
关键词
青海云杉林
海拔梯度
土壤养分
排露沟流域
祁连山
Picea crassifolia forest
altitude gradient
soil nutrient
Pailugou Drainage Basin
Qilian Mountains
