摘要
为研究不同生产力竹林地土壤养分动态 ,在高产林和低产竹林地中进行土壤养分定位观察 ,结果表明 :1无论是高产地还是低产地土壤有机质、全氮含量在每年的 5月份处于最低谷 ,8月份以后开始缓慢回升 ,但最终并没有回复到上一年的水平 ,说明靠毛竹自肥作用是无法维护其地力的 ,必须人为补充有机肥料。 2 2种林地土壤水解氮、有效磷和速效钾含量都是 3月份达到峰值 ,5～ 8月处于低谷。土壤水解氮在 10月份开始回升 ,但有效磷和高产地速效钾 10月份仍处于很低水平。3总体上看 ,高产竹林地土壤养分较低产林地丰富 ,但由于高产林生物量大需要养分多。因而从需肥高峰土壤养分的暂时耗竭来看 。
To understand dynamic changes of soil nutrients under different bamboo stands,three bamboos were chosen to be sampling spots in either high yield or low yield bamboo stand during one year time.It is shown that both organic matter and total nitrogen appear the lowest level in May,they are rerising since August,but didn′t reach the same level of the year before,which indicates that bamboo can′t prevent soil nutrients from decreasing unless add some manure.Peaks of hydrolysis nitrogen,available phosphorus and rapid available potassium occur in March.Hydrolysis nitrogen begins to recover since October,but available phosphorus and rapid available potassium are still at low level.In general,the soil nutrients are richer in high yield bamboo stand than in low yield bamboo stand,but more nutrients are needed by bamboos owing to bigger biomass in high yield bamboo stand.Therefore,the shortage of soil nutrients is more severe during the thriving growth period.
出处
《竹子研究汇刊》
北大核心
2000年第4期46-49,71,共5页
Journal of Bamboo Research
关键词
毛竹
土壤养分
动态变化
施肥
产量
Phyllostachys pubescens
Soil nutrients
Dynamic change.
