科尔沁沙地南缘人工固沙林下土壤的酸度特征  

Soil Acidity Characteristics of Sand Fixation Forest in Southern Horqin Sandy Land

作　　者：张学利 ZHANG Xueli(Liaoning Research Institute of Sandy Land Control and Utilization,Fuxin 123000,Liaoning;Liaoning Zhanggutai Horqin Sandy Land Ecosystem Research Station,Fuxin 123000,Liaoning)

机构地区：[1]辽宁省沙地治理与利用研究所,辽宁阜新123000 [2]辽宁章古台科尔沁沙地生态系统国家定位观测研究站,辽宁阜新123000

出　　处：《温带林业研究》2024年第1期15-20,32,共7页Journal of Temperate Forestry Research

基　　金：辽宁省农业科学院学科交流合作项目(2020HZ196203)。

摘　　要：【目的】了解科尔沁沙地南缘人工固沙林土壤的酸度特征,明确人工固沙林对土壤生态过程的影响。【方法】选取辽宁章古台国家级自然保护区的四种树种人工固沙林为研究对象,对樟子松、油松、赤松和杨树人工固沙林下不同土层土壤酸度的强度指标和容量指标进行对比研究和统计分析。【结果】不同树种0~10 cm、10~30 cm土层土壤水浸pH值和盐浸pH值的差异分别达到了显著和极显著水平,油松的水浸pH值和盐浸pH值最低,杨树的水浸pH值和盐浸pH值最高。不同树种0~10 cm土壤交换性酸度和交换性H+的差异均达到了极显著水平,水解性总酸度的差异达到了显著水平;除水解性总酸度外,油松土壤的交换性酸度和交换性H+最高,杨树的土壤交换性酸度、交换性H+和水解性总酸度最低。不同树种10~30cm土壤交换性酸度和交换性H+的差异均达到了极显著水平,水解性总酸度的差异达到极显著水平;油松的土壤交换性酸度和交换性H+最高,杨树的土壤交换性酸度和交换性H+最低;赤松的水解性总酸度最高,杨树的水解性总酸度最低。杨树林下的盐浸pH值0~10 cm土层与10~30 cm土层存在极显著差异,其他同一树种不同土层土壤酸度特征的强度指标均无显著差异;在容量指标方面,樟子松、油松0~10 cm土层的交换性总酸度和水解性总酸度均显著或极显著地高于10~30 cm土层;赤松林地0~10 cm土层的水解性总酸度显著高于10~30 cm土层,而交换性总酸度等指标无显著差异;杨树林地0~10 cm土层与10~30 cm土层交换性总酸度存在极显著差异,水解性总酸度无显著差异。【结论】在营造人工固沙林后,由于生态系统植被组成和农业土壤pH值的改变,科尔沁沙地南缘人工固沙林下土壤酸度特征发生了明显变化。【Objective】To understand soil acidity characteristics of sand fixation forest in southern Horqin sandy land,so as to clarify the effect of sand-fixation forest on soil ecological process.【Method】Four tree species of sand fixation forest in Liaoning Zhanggutai National Nature Reserve were studied.The intensity and capacity acidity indices in different soil layers of Pinus sylvestris var.mongolica,Pinus tabulaeformis,Pinus densiflora and poplar were contrastively investigated and statistically analyzed.【Result】The differences of current pH value(pHH2O)and potential pH value(pHKCl)in 0-10 cm and 10-30cm soil layers were significant and extremely.The current pH value and potential pH value in different soil layers of Pinus tabulaeformis are the lowest,and the current pH value and potential pH value in different soil layers of poplar are the highest.The differences of exchangeable acidity,and the concentration exchangeable H+in 0-10 cm soil were all extremely significant between four tree species respectively.The difference of total hydrolytic acidity in 0-10 cm soil were significant between four tree species.The exchangeable acidity and exchangeable H+concentration in 0-10 cm soil layers of Pinus tabulaeformis were the highest,and the exchangeable acidity and exchangeable H+concentration in 0-10 cm soil layers of poplar were the lowest.The total hydrolytic acidity of Pinus densiflora was the highest,and poplar was the lowest.There was a significant difference between 0-10 cm soil layer and 10-30 cm soil layer under poplar forest,and there was no significant difference in the intensity indexes of soil acidity characteristics in different soil layers of the same tree species. In terms of capacity indexes,the exchangeable total acidity and hydrolytic total acidity of 0-10 cm soil layer were significantly higher than those of 10-30 cm soil layer in Pinus sylvestris var. mongolica and Pinus tabulaeformis forests. The hydrolytic total acidity in 0-10 cm soil layer was significantly higher than that in 10-30 cm

关 键 词：固沙林 酸度特征 强度指标 容量指标 

分 类 号：S714.2[农业科学—林学]