章古台不同林龄樟子松人工林土壤水分研究  

Study on soil moisture of Pinus sylvestris var. mongolica plantations at different ages in Zhanggutai

作　　者：韩辉 张学利 宋鸽 马悦 王悦 HAN Hui;ZHANG Xueli;SONG Ge;MA Yue;WANG Yue(Liaoning Zhanggutai Desert Ecosystem Research Station;Liaoning Institute of Sandy Land Control and Utilization,Fuxin 123000,China;Dagujia Forest Farm of Qingyuan Manchu Autonomous County,Fushun 113300,China)

机构地区：[1]辽宁章古台科尔沁沙地生态系统国家定位观测研究站 [2]辽宁省沙地治理与利用研究所,辽宁阜新123000 [3]国有清原满族自治县大孤家林场,辽宁抚顺113300

出　　处：《辽宁林业科技》2022年第5期7-11,共5页Liaoning Forestry Science and Technology

摘　　要：为探究科尔沁沙地南缘不同林龄樟子松人工林土壤水分差异性,以章古台不同林龄樟子松人工林为研究对象,利用TDR水分仪对0~200 cm土层的土壤水分进行5年定位测定,同时监测降水量。结果表明:在年际尺度上,樟子松各林龄土壤含水量随年降水量的变化呈现上下波动,同时,各林龄土壤含水量差异显著(P<0.05),55 a最高。4-10月,樟子松各林龄土壤含水量从表层到深层均表现出与降水季节变化相似的变化规律。0~60 cm土层土壤含水量受降水量的影响最明显,波动幅度最大,由低到高依次为62 a、25 a、55 a、37 a和15 a。在垂直空间上,樟子松各林龄土壤含水量都表现出随土层深度增加而下降的趋势。0~60 cm土层,15 a和37 a土壤含水量较高,与其他林龄均差异显著(P<0.05),62 a土壤含水量最低,与其他林龄差异显著(P<0.05)。80~120 cm土层,55 a和62 a土壤含水量较高,与其他林龄均差异显著(P<0.05)。150~200 cm土层,25 a和55 a土壤含水量较高,与其他林龄均差异显著(P<0.05),其他林龄之间两两差异显著(P<0.05)。不同林龄樟子松人工林受海拔、密度、微地形、土壤质地结构的影响均较大,土壤水分没有表现出一致的规律性,但是密度最小的林分土壤含水量最高,因此通过密度调节可改善林地土壤水分状况,该研究为科尔沁沙地南缘植被可持续建设提供了科学依据。The soil moisture at the depth of 0~200 cm was determined by Time Domain Reflectometry moisture meter(TDR)in Zhanggutai,and the precipitation was observed for five years to explore the differences of soil moisture in Pinus sylvestoris var. mongolica plantations at different ages in the south edge of Horqin Sandy Land. The results showed that the soil moisture of P.sylvestris var. mongolica at different ages fluctuated with annual precipitation at the interannual scale,and the soil moisture of different ages had significant differences(P<0.05),with 55a being the highest. From April to October,the soil moisture from surface to deep layer in P.sylvestris var. mongolica of different ages showed similar change patterns as the seasonal variation of precipitation. The soil moisture in 0~60 cm soil layer was most obviously affected by precipitation,and the fluctuation range was the largest,which was 62a,25a,55a,37a and15a from low to high at different ages. In vertical scale,soil moisture at different ages all showed a decreasing trend with the increase of soil depth. At the 0~60 cm soil layer,soil moisture of 15a and 37a were the highest and had significant differences with other forest ages(P<0.05),while soil moisture of 62a was the lowest and significant different from that of other forest ages(P<0.05).In 80 ~ 120 cm soil layer,soil moisture were the highest at 55a and 62a,and the differences were significant with other forest ages(P<0.05). Among 150~200 cm soil layer,soil moisture at 25a and 55a were highest and had significantly differences with other forest ages(P<0.05),and the differences between other forest ages were significant(P<0.05).The soil moisture in P.sylvestris var. mongolica plantation of different ages showed no consistent regularity,and was greatly affected by altitude,stand density,microtopography and soil texture.However,the forest with the lowest density had the highest soil moisture,which indicated that soil moisture may be improved by stand density regulation. This study provided a scientific ba

关 键 词：章古台 樟子松 土壤含水量 林龄 

分 类 号：S791.253.02[农业科学—林木遗传育种]