Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2019, Vol. 40 ›› Issue (6): 1213-1222.DOI: 10.3969/j.issn.1000-2561.2019.06.025

• Ecology and Review • Previous Articles     Next Articles

Soil Nutrients and Biological Characteristics in Eucalyptus Plantations of Different Planting Ages at North Guangxi

DUAN Chunyan1,5,HE Chengxin2,5,*(),XU Guangping2,*(),HUANG Yuqing3,LUO Yajin4,TENG Qiumei2,ZHANG Denan2,ZHOU Longwu2   

  1. 1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin, Guangxi 541006, China
    2. Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi 541006, China
    3. Key Laboratory of Environment Change and Resources Use in Beibu Gulf / Guangxi Key Laboratory of Earth Surface Processes and Intelligent Simulation / Guangxi Teachers Education University, Nanning, Guangxi 530001, China
    4. Administration Bureau of Yachang Orchid National Nature Reserve, Baise, Guangxi 533209, China
    5. College of Life Sciences, Guangxi Normal University, Guilin, Guangxi 541006, China;
  • Received:2018-12-03 Revised:2019-02-18 Online:2019-06-25 Published:2019-07-02
  • Contact: HE Chengxin,XU Guangping

Abstract:

By the methods of the spatial-temporal substitution method, we studied the change characteristics and correlations of soil nutrient, microbial biomass and enzyme activity at four soil depths (0-10, 10-20, 20-30 and 30-40 cm) of Eucalyptus plantations with different ages (1, 2, 3, 4 and 5 a) in the hilly areas of north Guangxi. The soil nutrient decreased with the increase of soil depth. Contents of soil organic carbon and available nitrogen increased with the increase of age of forest. In contrast, total phosphorus showed a decreasing trend, total potassium and available potassium increased after an initial decrease. There was no obvious rule of total nitrogen and available phosphorus. The soil pH values decreased with the increasing of stand ages, and increased with the increase of soil depth. The effects of stand ages on soil microbial quantity and microbial biomass were evident, which decreased with the increasing of soil depth. Bacteria accounted for most percentage parts in the sum of microbial population, followed by actinomycetes and fungi. Bacteria, fungi, microbial biomass nitrogen and microbial biomass phosphorus all appeared to have a ascent trend after an initial decline with the increase of stand ages, actinomycetes showed a tendency of decrease, microbial biomass carbon increased gradually, respectively. Soil enzyme activity all decreased with the increase of soil depth, increased with the increase of forest age. The effects of stand ages on soil biological characteristic were evident, and details about peaks differed. The microbial quantity, microbial biomass and soil enzyme had a significant relationship with soil nutrient, which could be used as the good biological indicators to evaluate soil quality and represent the change trend of soil fertility level to some extent.

Key words: eucalyptus plantations, soil nutrient, microorganism, enzyme activity, forestage

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