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(一)子长县毛家河行政村,海拔1089～1323.3米。总土地面积26700亩,其中宜林面积13000亩,已造林6700亩,内有刺槐2700亩。该村1965年引入刺槐,在四旁零星栽植。1968年以每亩60～100株密度在山坡栽植30亩,生长迅速,很受群众喜爱。1976年,在反坡梯田上营造密度为330株刺槐林47亩。此后又营造密度60株、70株、100株、150株、200株、400株刺槐林2000多亩。密度不同生长状况差异很大,干部、群众褒贬不一,莫衷一是。为弄清哪种密度刺槐生长好,我们利用蹲点之便做了调查。现将调查结果叙述如下。1.房前屋后栽植生长快。芦岔河村薛秉章、毛家河村周培宽,1956年、1969年分别
(A) Zi County Maojiahe administrative village, elevation 1089 ~ 1323.3 meters. The total land area of 26700 acres, of which 13000 acres of forest area, afforestation 6,700 acres, 2700 acres of acacia within. The village in 1965 the introduction of acacia, sporadic planting on all sides. 1968 to 60 acres per acre planted density of 30 acres on the hillside, growing rapidly, loved by the masses. In 1976, a total of 47 acres of 330 Robinia pseudoacacia forests were planted on the anti-sloping terraces. Since then, it has also created a density of 60 acres, 70 plants, 100 plants, 150 plants, 200 plants and 400 plants of 2000 acacia forests. The density of different growth conditions vary greatly, cadres and the masses are mixed, indifferent. In order to find out what kind of density Robinia grows well, we make use of the investigation done. Now the survey results are described below. 1. Housing grow fast after the house. Lvchahe village Xue Pingzhang, Mao Jiahe village Zhou Peikuan, 1956, 1969 respectively