As one of the three major fast-growing tree species in the world, eucalypt is featured with great variety, strong resistance to stress and wide adaptability. It is significant to research the diversity and functions of soil microorganisms which affect the growth of trees by participating in the processes of nutrient element cycling and energy flow and play an important role in improving soil fertility and productivity. However, with limitations in knowledge of soil microbial communities and functions due to the complexity of the eucalypt forest ecosystem and research techniques of soil microbiology, researches on the characteristics of soil microbial communities in eucalypt forests so far are still in the primary stage. This study is aimed to conduct a systematic review of the research progress on soil microbial characters in eucalypt forests with different management patterns, stand types and stand ages. Compared with natural forests of eucalypt, there was generally a lower soil microbial abundance in eucalypt plantations whereas there was an increase in the abundance, diversity, and activity of soil microorganisms in eucalypt mixed forests compared with eucalypt plantation pure forests and the abundance of soil microorganisms in eucalypt forests generally increased with the age of the forest, while the diversity of ectomycorrhizal and endomycorrhizal fungi decreased with the age of the forest. In addition, with an analysis of the mechanism of soil microorganisms involved in nutrient element cycling and remediation of heavy metal pollution in eucalypt forests and prospects of future research and analyzing methods of soil microbiome and application of microorganisms, this study will provide scientific guidance for the maintenance of forest soil health and the promotion of green and sustainable forestry development. [Ch, 1 tab. 94 ref.]
There is a long history of use of wild edible vegetables in China. They have abundant functional components, including mineral elements, amino acids, vitamins, polysaccharides, flavonoids and so on. It has important scientific significance and application value to study the basic components of wild edible vegetables for a comprehensive understanding of the nutrients and biological activities. We listed the main nutritional and functional components, summarized the current main research results in the biological activity, including: (1) the content of basic nutrients in wild edible vegetables; (2) the profiles of functional compounds in wild edible vegetables; (3) analysis of active components and efficacy of wild edible vegetables; (4) common methods and technologies to component analysis of wild edible vegetables. Wild edible vegetables are rich in basic nutrients and bioactive substances, including vitamins, phenols and terpenes, which have good activities in antibacterial, antioxidant, antitumor and anti-inflammatory. Future research should focus on functional components and biological activities, and serves as a reference for subsequent development and application. [Ch, 2 tab. 74 ref.]
As a main way of soilless culture, substrate culture is widely used in seedling cultivation and production and recent years have witnessed an increasing interest in the research on the production of organic cultivation substrates using agro-forestry wastes. Therefore, the development of high-water-holding molding organic substrates by adding auxiliary materials such as binders and super absorbent polymers is of great significance to the better utilization of agro-forestry wastes as substrate and soil improvement agent. This study, with an analysis of the the development trend of organic substrate and problems existing in its practical application, is aimed to investigate the current situation of water modulation, high-water-holding molding organic substrates and the soil improvement as well as the existing problems and future development trends in order to provide insight for the development of cultivation matrix in the future. [Ch, 72 ref.]
With the comparion of the five thermal methods commonly used for trunk sap flow measurement with the focus on their respective advantages and disadvantages under different research objectives and experimental circumstance, this study is aimed to provide reference for practices in liquid flow measurements of standing trees. Of the five thermal methods commonly employed, Heat Pluse Velocity Method (HPVM) has mainly been used to calculate the flow rate by measuring the time required for the heat pulse to reach the thermocouple. Heat Balance Method (HBM) is used to calculate the sap flow by means of the energy balance between the heat input via the heating element, the heat conduction and the heat carried by the sap flow. Whereas Thermal Dissipation Method (TDM), Heat Field Deformation (HFD), and External Heat-Ratio (EHR) all use the temperature difference to characterize the thermal field changes caused by the sap flow before the sap flow rate and density are determined. In recent years, with the employment of relevant thermal technology, researches aimed to improve the existing thermal technology methods have been rewarded with higner sap flow measurement accuracy of HBM, HFD and EHR. Neither HBM nor EHR has been widely employed due to the complex measurement process and uncertainly in the configuration of the micro external gauge respectively. TDM and HPVM still suffer from low accuracy of determination despite the relatively mature commercial products of them. In conclusion, improperly selected determination methods will lead to great deviation in research rusults, therefore, is it proposed that suitable methods should be chosen in accordance with different experimental conditions so as to better promote the measurement accuracy of tree sap flow. [Ch, 1 fig. 1 tab. 58 ref.]
Bimonthly, Start in 1984
Supervisor:Department of Education of Zhejiang Province
Sponsor:Zhejiang A&F University
Editor-in-Chief:SHEN Xi
Editor:Editorial Department of Journal of Zhejiang A&F University
Tel:0571-63732749,0571-61060968
E-mail:zlxb@zafu.edu.cn
-
1
Carbon-fixing oriented management patterns of Phyllostachys pubescens and their benefits
WANG Xi-feng, SHEN Yue-qin, WANG Feng, ZHENG Xu-li, HU Zhong-ming -
2
Continuum removal based hyperspectral characteristic analysis of leaves of different tree species
DING Li-xia, WANG Zhi-hui, GE Hong-li -
3
Research progress on agronomic characteristics of Miscanthus
ZHAN Wei-jun, REN Jun-xia, JIN Song-heng, HUANG You-jun, PAN Yin-hui, ZHENG Bing-song -
4
Efficacy of three insecticides against Phenacoccus kaxinus and Eucryptorrhynchus brandti
CHU Jiamiao, ZHONG Tailin, HUANG Shanshan -
5
Application and prospect of organic biocides in timber preservation
SUN Fang-li, BAO Bin-fu, CHEN An-liang, ZHOU Yue-ying, YU Hong-wei, DU Chun-gui