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Comparison of functional properties of ecosystems for rubber plantations under different tapping systems (Record no. 56005)

MARC details
000 -LEADER
fixed length control field	03459nam a2200241Ia 4500
100 ## - MAIN ENTRY--AUTHOR NAME
Personal name	Jusheng Jiang
245 #0 - TITLE STATEMENT
Title	Comparison of functional properties of ecosystems for rubber plantations under different tapping systems
260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT)
Name of publisher	Proceedings of IRRDB Symposium 1999, Hainan, Peoples Republic of China. pp.131-146.
520 ## - SUMMARY, ETC.
Summary, etc	The ecosystems of rubber plantations of clone PR 107 under S/2 D/2 (old or traditional tapping system) and S/2 D/4 + ET (new tapping system) were designed for positional observation of soil nutrients, leaf nutrients, physiological parameters of latex, meteorological factors and yield. Comparative analysis of single and multi-factors of the resultant data derived from two years observation manifested that the material recycle and energy metabolism under similar environmental conditions and management were obviously higher in the rubber plantations under new tapping system than under the old system. The plantations under new system consumed more soil organic matter (6.6;), soil nitrogen (9.8;), soil available potassium (2;) and soil water (1091.69 kg/ha) annually than those under old system but less soil available phosphorous. The plantations under new tapping system contained soil available phosphorous 115;higher than those under old tapping system, which was likely due to improved energy metabolism responsible for enhanced utilization efficiency of phosphorous and hence for less soil available phosphorous, or due to improved availability of soil phosphorous by changing root-system ecological environment after ethylene stimulation. The principal factors influencing physiological functions of the two rubber plantation ecosystems (new and old tapping systems) were different in some way. The effect of Mg+2 content of leaf on DRC of latex and the effect of maximum temperature on R-SH of latex were similar in the plantations under both new and old systems, whereas the ecological factors affecting Pi, Mg+2 and sucrose content of the latex were different under both ecosystems. The physio-ecological factors comprehensively influencing the latex producing function of the two ecosystem were different. The main factors affecting average yield per unit area and per tree included Mg+2 content of leaf and raining days per month for the new tapping system, whilst DRC of latex and the content of soil organic matter for the old tapping system. The above suggested that the environmental condition adapted to growth of the rubber tree had changed greatly after the new tapping system was adopted. The control techniques for the rubber plantation ecosystem of the new tapping system should include improvement of components of fertilizer and changing of the frequency and date of fertilizer application, application of organic fertilizer for improvement of soil organic matter, and establishment of plant covers of rubber plantations for conserving water and increasing fertility. The phosphorous metabolism observed in the rubber plantation under the new tapping system needs further research.
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term	Contrast research
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term	Functional properties
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term	New tapping system
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term	Old tapping system
650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM
Topical Term	Rubber plantation ecosystem
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name	Guishui Xie
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name	Junming Chen
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name	Mingdao Cai
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name	Weifu Lin
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name	Xianhai Zeng
700 ## - ADDED ENTRY--PERSONAL NAME
Personal name	Yuekun Wang
942 ## - ADDED ENTRY ELEMENTS (KOHA)
Koha item type	Journals

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