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• W2391374188 abstract "For the past two decades, society has become increasingly aware of the problem of forest degradation. The effects of forest degradation transcend individual countries and now impact global processes. Research on the restoration of degraded forest has become one of the key issues in global ecology. Of particular concern are the effects of human activities on the forest productivity and site fertility, especially as the demands for fuel and timber from tropical forests are increasing. The response of biomass production in a Pinus massoniana forest to human impacts in subtropical China was studied in an experiment comparing harvesting (according to local practice) and control (no harvest) plots over a ten year period of 1990 to 2000. In the treatment plots, local people continued to harvest litter and understory according to local practice (about 2～3 times a year) from the beginning of the experiment in May 1990. The harvesting according to local practice occurred during the period 1990～1995 after which time it was stopped. Control plots were protected from any harvesting. In treatment plots, the total organic matter removed by this harvesting practice during 1990 to 1995 was 21.21 t/hm~2. In control plots, after stopping harvesting practice the understory biomass increased at an annual rate of 34 to 53 percent during the first 5 years from 2.23 t/hm~2 to 11.10 t/hm~2, followed by a slight decline over the remaining 5 years from 11.10 t/hm~2 to 9.44 t/hm~2. The standing stock of forest floor litter was mainly composed of understory plants and reflected the pattern of understory biomass production. The biomass of pine trees in both treatment and control plots increased over time, although the number of individuals of pine trees decreased. However, the biomass increment of pine trees varied depending on plots and on years. From 1990 to 1995, the biomass increased by 38.3% (from 81.2 t/hm~2 to 112.3 t/hm~2) in control plots and was higher than that in treatment plots (33.6%), which increased from 98.8 t/hm~2 to 132.0 t/hm~2. From 1995 to 2000, the biomass in control plots increased by 29.1 percent (from 112.3 t/hm~2 to 145.0 t/hm~2) and was lower than that in treatment plots (32.2%, harvesting was also stopped during 1995~2000), which increased from 132.0 t/hm~2 to 174.7 t/hm~2. Thus, from 1990 to 1995, harvesting practice resulted in about 1.6 percent of biomass decrease each year in treatment plots, which was about 1.58 t/(hm~2·a) and accounted for 34 to 46 percent of total organic matter removed directly each year by this harvesting practice." @default.
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• W2391374188 date "2004-01-01" @default.
• W2391374188 modified "2023-09-23" @default.
• W2391374188 title "Response of biomass production to human impacts in a pine forest in subtropical China" @default.
• W2391374188 hasPublicationYear "2004" @default.
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