摘要
对现存岷江柏分布区土壤物理性质的空间差异性研究表明 ,土壤容重理县居群最小 ,最大的为茂县居群 ,理县居群与茂县、马尔康、丹巴居群间有显著性差异 .土壤总孔隙理县居群较大 ,但其孔隙组成中毛管孔隙与非毛管孔隙比 (CP NCP)较小 ;金川、小金、马尔康和丹巴居群虽土壤总孔隙不大 ,但其孔隙组成较合理 ;茂县居群土壤总孔隙小 ,非毛管孔隙数量又大 .土壤持水量直接与土壤孔隙状况有关 ,最大持水量和毛管持水量理县居群最大 ,茂县居群土最小 ,茂县居群土壤持水量与其它居群间有显著性差异 .土壤自然含水量是土壤孔隙状况与持水能力的综合体现 ,0～ 2 0cm层土壤自然水量顺序为 :丹巴 >金川 >小金 >理县 >马尔康 >茂县 ,茂县居群与其它居群土壤自然含水量有显著性差异 .建议在干旱河谷区实施造林规划时 ,选择土体较稳定、人为干扰少、种植初期有水源保障的阴坡或半阴坡 .图 5表 3参 2
The study was conducted in Cupressus chengiana forests with relation to geographical distribution. Soil physical properties (bulk density, total porosity, capillary porosity, non-capillary moisture, maximum moisture capacity, capillary moisture capability and natural water content) were investigated and their geographical differences were compared. Soil bulk density was the highest in MX population, and the lowest in Lixian(LX) population which was significantly lower than those in Maoxian(MX), Markang(MRK) and Danba(DB) populations. Soil total porosity was biggest in LX population, but CPNCP was lower in its porosity composition; soil total porosity in Jingchuan(JC), Xiaojing(XJ), MRK and DB populations were lower than that in LX population, but the capillary porosity was main in their porosity composition; soil total porosity was lowest in MX population and CPNCP was high. Soil moisture capacity was controlled by soil porosity condition. Soil maximum moisture capacity and capillary moisture capacity was biggest in LX population and lowest in MX population, and soil moisture capacity in MX population was significantly low than that in other populations. Soil natural water content was synthetical embodiment of soil porosity condition and soil moisture capacity. Topsoil (0～20 cm) natural water content in C. chengiana forest in different geographical populations showed the order, DB>JC>XJ>LX>MRK>MX, and soil natural water content in MX population was significantly low than that in other population. It is suggested that lunar slope or semi-lunar slope, with less human-induced and stable soil structure, should be selected when afforestation layout was carried out in dry and drought valley to ensure enough moisture at plantation initial stages. Fig 5, Tab 3, Ref 24
出处
《应用与环境生物学报》
CAS
CSCD
2004年第5期596-601,共6页
Chinese Journal of Applied and Environmental Biology
基金
中国科学院方向性资助 (KSCX2 SW 1 0 4 )
中国科学院知识创新工程重大项目 (KSCX1 0 7 0 2 )
"十五"国家重大科技攻关项目(2 0 0 1BA60 6A 0 5)项目资助~~
关键词
岷江柏居群
土壤物理性质
地理空间差异
干旱河谷
川西
Cupressus chengiana
soil physical properties
geographical spatial difference
dry and drought valley
western Sichuan
