兴文县香椿人工林土壤物理性质研究

以柳杉人工林、柏木人工林及耕地为对照,研究了不同定植年限香椿人工林的土壤物理性质变化。结果表明:①香椿人工林土壤体积质量随定植年限的增长而减小,不同林分在0~40 cm土层中,土壤体积质量以定植4年香椿林为最大,柏木人工林最小,分别为1.58 g/cm3和1.31 g/cm3。②随定植年限增加,土壤孔隙度、持水量及贮水量均增大,各林地及耕地土壤孔隙度、持水量及贮水量均随土壤深度的增加而减小。③在0~40 cm土层中,柏木人工林的总孔隙度和非毛管孔隙度最大,香椿人工林次之,耕地最小;而毛管孔隙度香椿人工林最大,柳杉人工林最小。④在0~40 cm土层中,各林地及耕地土壤最大持水量、毛管持水量及田间持水量均为柏木人工林香椿人工林柳杉人工林耕地,土壤贮水量为香椿人工林柳杉人工林耕地柏木人工林。⑤香椿人工林土壤物理性质随林龄的增加而改善,明显优于柳杉人工林及耕地,仅某些指标较差于柏木人工林。

Soil Physical Properties of Toona sinensis Plantation in Xingwen County

Compared with Cryptomeria fortune and Cupressus funebris artificial forest and farmland, the changes of soil physical properties under Toona sinensiss plantation with different planting ages were studied. The results showed: 1) soil bulk density of Toona sinensiss plantation reduced with the increase of planting age, soil bulk density in the layer of 0-40 cm was greatest under the planting age 4 years of Toona sinensiss plantation but was lowest of Cupressus funebris plantation with, which was 1.58 g/cm3 and 1.31 g/cm3 respectively. 2) With the increase of planting age, soil porosity, water holding capacity and water storage capacity increased gradually. With the increase of soil depth, soil porosity, water holding capacity and water storage capacity of different forests and farmland decreased gradually. 3) In the layer of 0-40 cm, soil total and uncapillary porosity of Cupressus funebris plantation were highest, then followed by Toona sinensiss plantation and farmland. However, soil capillary porosity of Toona sinensiss plantation was highest and that of Cryptomeria fortune plantation was lowest. 4) In the layer of 0-40 cm, the order of soil maximum water holding capacity, capillary water holding capacity and field water capacity was Cupressus funebris plantation > Toona sinensiss plantation > Cryptomeria fortune plantation > farmland, but soil water storage capacity was Toona sinensiss plantation > Cryptomeria fortune plantation > farmland > Cupressus funebris plantation. 5) The soil physical on Toona sinensiss plantation was getting better with the increase in planting time of forest-belts, much better than Cryptomeria fortune plantation and farmland, only certain indicators were poorer in Cupressus funebris plantation.