复壮技术实施对古树根境土壤和新梢生长的影响——以平湖市古银杏为例

Effects of the Implementation of Rejuvenation Technologies on the Soil in theRhizosphere of Ancient Trees and the Growth of New Shoots——A Case Study of Ancient Ginkgo biloba in Pinghu City

通过实施砌筑排水透气暗沟、土壤开挖和根系处理、回填土配置及更换土壤、整枝修剪、树体清腐、树体填补、加箍固定、支撑保护等复壮技术对平湖市的1株古银杏进行复壮保护,监测和分析了复壮技术实施前后土壤质量变化和新梢生长情况。结果表明:古银杏土壤有机碳、全氮含量显著增加了50.9%和60.1%(P<0.05),土壤C∶P、C∶K、N∶P、N∶K也显著提高(P<0.05),土壤容重下降了31.3%(P<0.05),而总孔隙度则增加了65.1%(P<0.05),土壤指标间具有显著性相关的数量由8对降低到4对。古银杏新梢生长量显著增加了28.9%~34.7%(P<0.05)。

The rejuvenation and protection of an ancient Ginkgo biloba tree in Pinghu City was carried out through the implementation of rejuvenation techniques,such as the masonry of drained and ventilating ditches,soil excavation and root treatment,allocation of back filled earth and replacement of soil,branch pruning and trimming,tree body decaying,tree body filling,hoop fixing and support protection,the changes of soil quality and the growth of new shoots before and after the implementation of rejuvenation techniques were monitored and analyzed.The results showed that the contents of soil organic carbon and total nitrogen increased by 50.9%and 60.1%(P<0.05),and the ratios of carbon to phosphorous,carbon to potassium,nitrogen to phosphorous,nitrogen to potassium in soil were also significantly increased(P<0.05).The volume weight of soil decreased by 31.3%(P<0.05),while the total porosity increased by 65.1%(P<0.05),and the number of significant correlations among the soil indexes decreased from 8 pairs to 4 pairs.The growth of new shoots in ancient Ginkgo biloba was significantly increased by 28.9%~34.7%(P<0.05).