沙棘对辽宁西部杨树人工林土壤水分动态变化的影响研究

Effects of Seabuckthorn on Soil Moisture Variation of Poplar Plantation in West Area of Liaoning Province

通过将沙棘与小黑杨和欧美杨64号的人工林分别按株混和行混2种方式进行混交实验,研究了固氮植物沙棘对辽宁西部杨树人工林土壤水分动态变化的影响。研究结果表明:(1)在0～20 cm的表层土壤中,混交林的含水量均显著高于各自纯林的含水量(p<0.01),20～120 cm的深层土壤中,混交林的土壤含水量整体趋势表现为显著低于各自纯林中的土壤含水量,只有8月处理Ⅰ纯林和混交林的土壤含水量没有显著差别;(2)2000年6,8,9月,同一人工林两两月份间的土壤含水量均有明显差别,土壤含水量大小顺序都是8月>9月>6月,不同月份间土壤含水量的差异大小随土壤深度、杨树品种、混交方式的变化而变化;(3)杨树人工林不同土层含水量与天然降水之间有明显的相关性(r^2>0.90),天然降水是杨树与沙棘混交林及杨树纯林土壤水分的主要来源。

The effects of seabuckthorn(Hippophae rhamnoides L. ), a nitrogen-fixing plant, on the soil moisture variation of poplar plantation in the West Area of Liaoning Province were examined. In a 3-year project seabuck- thorn was introduced into poplar stands of two different varieties (Populus cv. 'Xiaohei' and Populus euramericane cv, 'N3016')in two different mixing designs (individual-or strip mixing patterns). The results were as follows: (1 ) in the depth of 0～20 cm, the soil moisture of the mixed stands was significant higher that of the pure one, but in the depth of 20～ 120 cm , the results was contrary to the former irrespectively of poplar variety or mixing pattern, (2) in June, August and September of 2000, the difference of poplar plantation soil moisture between two months was significant and varied with soil depth, poplar variety and mixing patterns, (3) poplar plantation soil moisture of different soil depth had remarkable correlation with the amount of rainfall (r^2>0. 90). The rainfall was the main resource of water of poplar plantation.