探讨了短期覆盖经营(覆盖1 a)、休养式覆盖经营(覆盖3 a 后休养3 a)、长期覆盖经营(覆盖6 a)和不覆盖雷竹林(CK)2年生立竹叶片养分含量、化学计量比和再吸收率及其与土壤养分的关系。结果表明：(1)短期和休养式覆盖经营促使雷竹叶片养分含量和再吸收率总体上提高,而长期覆盖经营对雷竹叶片 P 含量和N、K 再吸收率会产生较为明显的影响,叶片 P 含量、N 再吸收率显著升高,K 再吸收率降低；(2)短期和休养式覆盖经营对雷竹林土壤、叶片养分化学计量比影响不明显,但长期覆盖经营使雷竹林土壤、叶片 N∶P、K∶P 显著降低；(3)短期覆盖经营能增强雷竹林土壤养分与叶片的养分含量、化学计量比和养分再吸收率的相关性,但随覆盖经营年限的延长,相关性总体上呈减弱趋势；(4)土壤养分含量及其平衡关系对林地覆盖经营雷竹林叶片养分特征影响明显；(5)长期覆盖经营雷竹林土壤、叶片养分间相关性明显减弱,竹子吸收利用养分的能力下降,生产中应实行雷竹林休养式覆盖经营方式。研究结果为林地覆盖经营雷竹林的可持续发展提供了理论参考。
Correlations between soil nutrient contents and nutrient characteristics of Phyllostachys violascens leaves under mulching management
Phyllostachys violascens is a favorite bamboo shoot species that has been widely planted in southern China. High rate of fertilization and heavy winter mulch have been a common practice to gain a good yield and better eco-nomic benefit.However,the longterm use of the above techniques can also result in a series of negative environmental and ecological consequences,such as degradation of soil physical and biological properties,increases in soil heavy metal concentrations,premature degradation of bamboo forest ecosystems.In order to reveal the degradation mechanism of mulched stand of P .violascens forest,and provide theoretical guidence for regeneration of degraded bamboo forest, leaf nutrient concentration,nutrient stoichiometry,and nutrient resorption efficiency of 2-year culms from short-term mulching (1 a),respite-mulching (mulched 3 a and rest 3 a),long-term mulching (6 a)and non mulching stand(CK)were analyzed,as well as their relationships with soil nutrient characteristics were analyzed.The results showed that short-term and the respite-mulching treatment increased mature leavf N,P,K concentrations and leaf nutrient resorp-tion effiency compared with CK.Leaf P concentration,N,P resorption efficiency were influenced by long-term mulc-hing,which increased mature leavf P concentration and leaf N resorption efficiency,and decreased leaf K resorption ef-ficiency.Compared with CK,the short-term mulching and respite-mulching treatment did not affect stoichiometric ra-tio in leaves and soil,but long-term mulching treatment led to a decline in N∶P and K∶P.Compared with CK, short-term mulching treatment increased the correlation among soil and leaf nutrient concentration,nutrient stoichi-ometry,and nutrient resorption efficiency,but the correlation weakened with the increasing of mulching years.All re-sults showed that soil nutrient concentrations and their balances remarkably influenced leaf nutrient characteristics. The correlation among soil and leaf nutrient characteristics became less correlated,and the absorption capacity of nu-trients declined in the long-term mulched stand.The respite-mulching management should be applied in production practices.
国家科技期刊平台
NSTL
万方数据
维普
