【摘要】 以云南省2-7年生直干桉人工林为研究对象,采用环刀法测量其林下土壤的物理性状及黏粒含量,为直干桉人工林可持续经营提供科学依据。结果表明,滇中、滇南一带的直干桉人工林土壤结构一般较好,土壤容重普遍在1.1-1.4g/cm~3之间,表现出由上到下逐渐变大的规律和随树龄的增加有先降后升的趋势;土壤总孔隙度随树龄的增加表现出先升后降再上升的特点;毛管孔隙度平均为42.90%-53.19%,具有较好的持水性;土壤饱和持水量平均为44.24%-55.22%,而且随树龄的增加也有先升后降再上升的趋势;土壤黏粒含量普遍大于25%,质地多为重黏土,土壤容易板结,干旱时变得坚硬。更多还原

【Abstract】 In this paper,the soil physical properties of Eucalyptus maidenii 2-7 years old in Yunnan Province were studied. The results showed that the soil structure of E. maidenii plantations in central Yunnan and southern Yunnan was generally good,and the soil bulk density was generally 1. 1-1. 4 g/cm~3,a gradually increasing tendency from top to bottom and decreasing with age increasing at the beginning then increasing at later; The total soil porosity showed the tendency of increase-decrease-increase mode; The average capillary porosity was 42. 90%-53. 19%,with good water binding capacity; The average soil saturated water content was 44. 24%-55. 22%,and with the increase of tree age,showed a tendency of increase-decrease-increase mode; The soil clay content was generally more than 25%,the soil texture was mostly heavy clay,easy to harden,hard in drought.更多还原