›› 2018, Vol. 36 ›› Issue (04): 0-0.

• •    下一篇

青花椒种植对土壤颗粒组成及分形维数的影响

周于波1,龚伟1,王景燕2,唐海龙2,赵昌平1,黄帅1,林梅1   

  1. 1. 四川农业大学
    2. 四川农业大学林学院
  • 收稿日期:2017-10-16 修回日期:2018-06-29 出版日期:2018-08-31 发布日期:2018-11-29
  • 通讯作者: 龚伟 E-mail:gongwei@sicau.edu.cn
  • 基金资助:
    四川省农作物育种攻关项目;四川省农业科技成果转化项目

Effects of planting Zanthoxylum armatum on soil particle composition and fractal dimension

  • Received:2017-10-16 Revised:2018-06-29 Online:2018-08-31 Published:2018-11-29

摘要: 【目的】为青花椒林土壤管理及退耕还林中经济林树种选择提供参考。【方法】以农耕地退耕形成的弃耕地和青花椒林为研究对象,研究不同退耕方式(青花椒地、弃耕地)以及青花椒种植年限(2 a、5 a、9 a、14 a)对土壤颗粒组成、分形维数(D)、理化性质和微生物数量的影响,探讨了分形维数与土壤肥力之间的关系。【结果】青花椒林和弃耕地土壤中粉粒(0.02 ~ 0.002 mm)和粘粒(<0.002 mm)含量、<0.02 mm与>0.02 mm粒级含量的比值(RPC)、分形维数、孔隙度、持水量、养分含量(弃耕地有效磷和速效钾除外)和微生物数量均高于对照农耕地,且随青花椒种植年限的延长而增加,相同年限的青花椒林高于弃耕地。土壤颗粒分形维数和<0.02 mm与> 0.02 mm粒级含量的比值与土壤物理性质、养分含量和微生物数量显著相关(p<0.05)。【结论】坡地退耕种植青花椒对提高小粒级土壤颗粒含量和改善土壤肥力状况的效果优于弃耕地;土壤颗粒分形维数和<0.02 mm与> 0.02 mm 粒级含量的比值均可表征坡地退耕后土壤肥力的变化状况。

关键词: 青花椒, 颗粒组成, 分形维数, 土壤肥力

Abstract: 【Objective】The objective of this study was to evaluate the selection of economic trees and soil of the Z. armatum during the process of soil management and returning farmland to forest.【Method】Different ways of returning farmland (Z. armatum plantation and abandoned farmland) and planting years (2 a, 5 a, 9 a, 14 a) were collected to determine soil particle composition, fractal dimension(D), soil physical, chemical properties and microbial quantity. The relationships of fractal dimension and soil fertility were evaluated.【Results】The result shows that the content of silt (0.02 ~ 0.002 mm), clay content (<0.002mm), ratio of soil particle content (<0.02 mm and >0.02 mm, RPC), fractal dimension, porocity, water content, nutrient content(except available phosphorus and available potassium in abandoned farmland) and microbial population in the Z. armatum plantation and abandoned farmland were higher than abandoned farmland significantly, and increased with increasing of Z. armatum cultivation years, and in the same year the indexes of the Z. armatum plantation was higer than those of the abandoned farmland. D and RPC had significantly correlated with soil physical properties (except bulk density), nutrient content and microbial population (p<0.05).【Conclusion】These findings indicate that the effect of Z. armatum plantation is better than abandoned farmland in increasing the soil particle content in small particle-size and improving the condition of soil fertility. D and RPC can be used for soil fertility elevation after de-farm.

Key words: Zanthoxylum armatum, particle composition, fractal dimension, soil fertility