摘要
通过东北东部山地落叶松人工林不同发育阶段土壤酸度变化规律以及与有机磷形态相关关系的研究发现,不同发育阶段落叶松根际土壤水解性总酸度都高于非根际土壤,而交换性酸与总酸度的比值则相反;落叶松由幼龄林到成熟林随林龄的增大根际土壤活性酸(pH值)呈降低趋势,而非根际土壤活性酸(pH值)(除成熟林外)、根际与非根际土壤的交换性酸、土壤交换性铝、土壤水解性总酸度和交换性酸/总酸度的比值随林龄的增大呈显著增大趋势.但由于暗棕壤具有较强的缓冲性能,并且土壤活性酸(pH值)由幼龄林到成熟林随林龄的变化范围为5.27±0.25～5.93±0.12,因此,在落叶松树种适生的范围之内,不需施用石灰调节土壤的酸度.各年龄阶段森林根际土壤酸度与根际土壤有机磷形态相关密切.随着土壤潜性酸度的增加,各年龄阶段森林土壤有机磷总量、中稳性有机磷和高稳性有机磷含量降低.活性有机磷分别与活性酸、水解性总酸度呈显著正相关,其与水解性总酸度相关性随林龄的增大而降低.
Changes in soil acidity and its correlation with organic phosphorus types were studied for larch （Larix olgensis） plantations with different development stages in mountainous area of eastern Northeast China. The results showed that total hydrolytic acidity in rhizosphere soil at different development stages were higher than those in non-rhizosphere soil, but the ratio of exchangeable acidity and total acidity in rhizosphere soil showed an opposite trend~ The active acidity （pH value） in rhizosphere soil decreased with stand age increased. While active acidity in non-rhizosphere soil （except for mature stand）, exchangeable acidity, exchangeable aluminum, total hydrolytic acidity, and the ratio of exchangeable acidity and total acidity in both rhizosphere soil and non-rhizosphere soil increased. Because dark brown soil had a strong buffering effect, the active acidity varied from 5.27±0.25 to 5.93±0.12 with stand ages, which suggested that larch be suitable to the variation of active acidity and lime application be unnecessary to adjust active acidity in soil. In rhizosphere soil, there was a strong correlation between soil acidity and organic phosphorus types in all development stages. With potential acidity increasing, total organic phosphorus, moderately resistant organic phosphorus, and highly resistant organic phosphorus in larch plantations decreased for all stands. There were significantly positive correlations between labile organic phosphorus and active acidity, labile organic phosphorus and total hydrolytic acidity. The correlation between labile organic P and total hydrolytic acidity decreased with stand age increasing.
出处
《生态学报》
CAS
CSCD
北大核心
2005年第11期2841-2847,共7页
Acta Ecologica Sinica
基金
国家自然科学基金资助项目(30271070)
黑龙江省自然科学基金资助项目(C01-17)~~
关键词
落叶松人工林
土壤酸度
有机磷形态
相关性
Larch plantation
soil acidity
organic phosphorus types
correlation
