浙江庆元杉木种子园中期低产主要原因及增产措施研究

浙南庆元杉木初级种子园管理细致,偏冠率仅6.8％,母树生长健壮,结实初3年产量也和高产的浙北横畈杉木种子园不相上下,亩产种子分别为0.34、1.44和2.48kg;但以后5年亩产一直徘徊在2kg左右,成为浙江的低产种子园。经4年调查研究,针对低产原因改变施肥配方,结合人工辅助授粉,机械法控制树势,病虫防治等综合措施,使1989年亩产种子达5.61kg,为当年全国、全省高产种子园之一。1990年为小年,但亩产量仍达2.6kg,略高于历年平均产量。1991年球果累累,预计大大超过1990年产量。现将调查、试验结果报告于下。

A Study on the Cause of Low Yield and Measurements of Raising Productivity of Chinese Fir Seed Orchard in Qingyuan,Zhejiang Province

The yield of this seed orchard has been fluctuating in about 30 kg/ha for five years since 1984. It was found, through several investigations, that the main cause of low yield were: improper fertilization after fruiting that caused excessive growth of trees; unfavourable climate in pollination period; the damage by insects and diseases. The yield rapidly raised up to 84.15 kg/ha in 1989 and over 60kg in 1990, after the integrated measurements had been adopted, that were: changing the make up of fertilizers--increasing the content of P and K; artificial complement pollination; bonding with wire and cutting bark in half-ring like on trunk and controlling of insects and diseases.