最近阅读了在美国“土壤学杂志”上刊登的“卡里佛欧尼亚大学”的马克普博士的很有趣的试验报告。该博士对“卡里佛欧尼亚洲”的巴枯雷的“邮——卡里林”(常绿乔木)皆伐后土壤水分中的(在现地用一定压力吸取的土壤溶液)草木灰、钙、氮等离子的浓度、酸度、传导度等、无论那一种都报告着比未采伐林地低的结果。这是因为它和 Recently I read a very interesting test report by Dr. Mark Pop from the University of Califonia at the American Journal of Soil Science. The Ph.D. researched the ash content of the soil moisture (in situ, soil solution drawn at a certain pressure) of the post-harvest “Post-Kalillin” (evergreen trees) of the Barre mine in “Carifo Ognia” Calcium and nitrogen plasma concentrations, acidity, conductivity, etc., all reported lower results than uncut timberlands. This is because it and