摘要
通过不同混交处理,12年生巨尾桉、杉木混交林土壤肥力及生物活性差异的分析,结果表明:不同混交处理桉杉混交林土壤肥力及生物活性差异程度取决于桉树混交比例,桉树混交比例越大其差异程度越显著,也就是说混交比例直接左右着各肥力因素:土壤最大持水量呈正相关、土壤容重呈负相关;土壤速效养分呈上升趋势、土壤水解总酸度则呈下降趋势;处理间土壤微团粒所占比例差异极显著、土壤团粒结构体所占比例差异显著、土壤结构破坏率(下降)则差异较显著;土壤生物活性(酶活性)形成一个既定的酶活性增强梯度。桉杉混交林对于改善土壤结构,提高土壤蓄水、保水能力和通透性能,增加土壤水稳性团聚体含量,改善土壤微生物生理类群,增强土壤酶活性,提高土壤养分的归还量和养分循环速率等发挥了不可替代的作用。处理中的3桉:1杉是较为理想的混交(株间)组合。
The differences of soil fertility and bioactivity were analysed by using the data obtained from the 12-year-old Eucalyptus and Cunninghamia lanceolata mixed forest with different mixed proportion. The results showed that the difference of soil fertility and bioactivity depended on the mixed proportion of Eucalyptus and Cunninghamia lanceolata. And the proportion of the Eucalyptus is higher, the difference is more significant, which means the mixed proportion influences various factors of fertility directly. The maximum water retaining capacity and available nutrients of soil increased as the proportion of the Eucalyptus increased, whereas bulk density and total acidity of soil decreased with the increasing of the proportion of Eucalyptus. Moreover, the ratio of soil aggregate, structure damage and micro-aggregate among different mixed forests were significant, relative significant and very significant, respectively. Finally, soil bioactivity strengthened in accordance with the rise of proportion of Eucalyptus, which formed a given gradient. In summation, the Eucalyptus and Cunninghamia lanceolata mixed forest played an irreplaceable role in soil fertility and bioactivity, which included the improvement of soil structure, permeability, water storage and retaining capacity, increase of soil water-stable aggregate content, improvement of soil microbial physiological groups, enhance of soil bioactivity, promotion of soil nutrients return and cycling rate and so on. Therefore, it was an optimal mixed forest when the ratio of the Eucalyptus and Cunninghamia lanceolata was three to one.
出处
《华东森林经理》
2011年第3期25-28,32,共5页
East China Forest Management
关键词
巨尾桉
杉木
混交林
土壤肥力
酶活性
差异
Eucalyptus grandis x E. Urophylla
Cunninghamia lanceolata
mixed forest
soil fertility
enzyme activity
difference
