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A large carbon sink in the rubber plantation ecosystem based on five years’ observation in Danzhou, Hainan, South of China
Zhixiang WU - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): A large carbon sink in the rubber plantation ecosystem based on five years’ observation in Danzhou, Hainan, South of China
ผู้แต่ง / หัวหน้าโครงการ (EN): Zhixiang WU
บทคัดย่อ (EN): Since the 1980s, climate warming has become a global environmental problem, and carbon dioxide is the most important factor in global warming. Human activities lead to the global elevated CO2 concentration, resulting in global warming. So, reducing CO2 emissions has become one of the world's most important tasks for governments of every country around the world. For China, a large developing country, the pressure of reducing CO2 emissions is becoming much higher. For this reason, it is particularly important to study the carbon balance of a variety of plantations as an important bargaining chip of carbon trade negotiations. On the other hand, high rubber price has resulted in rapid expansion of rubber plantations in the tropical areas of the world, which leads to some negative impacts and produces a lot of controversy on rubber trees planting in the tropical areas. In order to evaluate the carbon sink benefits of rubber plantation ecosystems correctly, we used the combination of biomass survey method and eddy covariance method to study the carbon storage and balance and its environmental control mechanism of rubber plantation ecosystem in Hainan, south of China in 2009-2013. Biomass inventory method and model simulations were used to estimate and calculate each sub-carbon pool of the rubber plantation ecosystem in the west part of Danzhou, Hainan, China. The average biomass carbon pool of rubber tree vegetation was 35.39 tC•hm-2, the soil organic carbon pool 94.96 tC•hm-2, the litter carbon pools 2.86 tC•hm-2, and the total amount carbon pool was 133.21 tC•hm-2. The annual growth of rubber tree biomass carbon pool was 4.61 tC•hm-2•a-1, the amount of the understory vegetation was 1.11 tC•hm-2•a-1, dry rubber contained a total of 1.41 tC•hm-2•a-1, plus litter carbon increment was 2.86 tC•hm-2•a-1, the net ecosystem carbon sequestration of rubber plantation ecosystem was 9.99 tC•hm-2•a-1. Forest ages of rubber plantation, management level, soil texture, litter accumulation and decomposition as well as tapping and other factors were the leading factors to affect the carbon accumulation of rubber plantation. And then some reasonable measures would be essential to take in order to improve the carbon storage and carbon sequestration of rubber plantation ecosystem. CRRI & IRRDB International Rubber Conference 2016, Siem Reap, Cambodia 298. The data quality and the feasibility of fluxes observation were analyzed, and dynamic characteristics of 3 fluxes components and their responses of environmental driving factors were analyzed. The turbulence data quality evaluation, the energy balance closure analysis, and the flux footprint and its source regions analysis have showed that the fluxes observations of the rubber plantation ecosystem are feasible, and data obtained are reliable, which can be used for research requirements. The daily net ecosystem exchange (NEE) dynamic of rubber plantation ecosystem in Hainan showed a single peak curve in all seasons. The daytime NEE was negative, indicating carbon was absorbed, and the nighttime NEE positive, indicating releasing of carbon. The diurnal NEE variation in the year showed a likely U shape curve. The total annual NEE of rubber plantation ecosystem was -11.10 tC•hm-2•a-1, and its capacity of carbon sequestration is very strong. The driving factors of rubber plantation ecosystem NEE are PAR (Photosynthetically Active Radiation), VPD (Vapor Pressure Deficit) and soil temperature 5 cm under the ground at the half an hour scale, and the stepwise regression equation of NEE with factors is: NEE=-0.001PAR +0.096VPD -0.10T_-5 -0.243. The NEE of rubber plantation ecosystem showed very notable negative correlation with the amount of precipitation and the monthly average LAI (Leaf Area Index) at the monthly scale. In addition, the environmental CO2 concentration and human activities affect the rubber plantation ecosystem NEE, too. The daily ecosystem respiration (Re) dynamic of rubber plantation ecosystem showed a single peak curve in all seasons. The Re amount and the change amplitude of daytime were obviously larger than those of nighttime. The diurnal Re changes of the year showed an irregular curve. Monthly Re amounts in rainy season were larger than those in dry season. The strongest month of respiration in rubber plantation ecosystem was August, and the weakest December. The total Re was 20.98 tC•hm-2•a-1. At the half an hour scale, the Re showed an exponential relation with the average air temperature (Ta), which can be calculated Q10 as 1.96. And the Re showed weak negative correlation with soil water content, weak positive correlation with VPD. At the monthly scale, the Re had a notable positive correlation with the precipitation and a weak positive correlation with LAI. The ratio of soil respiration to ecosystem respiration (Re) was very low, only 37.1%, and the vegetative respiration took a proportion of 62.9%. Factors affecting vegetative respiration will show more impact to ecosystem respiration than those affecting soil respiration. The daily dynamics of gross ecosystem productivity (GEP) in rubber plantation was a single peak curve in all seasons. Daytime GEP is positive, which means solar fixation and CO2 sequestration, and nighttime GEP is zero. There is no obvious midday depression of photosynthesis of GEP. The diurnal variation of GEP has an irregular unimodal curve. The GEP of each month in rainy season is larger than that in the dry season. The strongest GEP month is August, the weakest February, in which the trees defoliation. The average total gross ecosystem productivity of rubber plantation ecosystem in Hainan Island is 32.09 tC•hm-2•a-1. The GEP had positive correlations with PAR, all the temperature factors and VPD at the half an hour scale. And at the monthly CRRI & IRRDB International Rubber Conference 2016, Siem Reap, Cambodia 299 scale, the GEP has positive correlations with LAI and the amount of precipitation in rubber plantation ecosystem. The LUE (light use efficiency) in each month showed a U shape, which is opposite to the PAR. Carbon balance mechanisms of rubber plantation ecosystem were analyzed. Rubber plantation ecosystem in Hainan is a large carbon sink which was obtained with biomass inventory method and eddy covariance method, and the average annual carbon uptake is 9.99~11.10 tC•hm-2•a-1. The carbon balance of rubber plantation ecosystem is mainly affected by rubber trees’ growth characteristics and driving factors of external environment. Environmental factors include photosynthetic active radiation, temperature, moisture etc.. Compared with other forests, the photosynthetic capability of rubber plantation ecosystem is very high (GEP is huge); the total respiration of the system (Re) is very high; the net ecosystem exchange (NEE) is large. The yearly average Z value of the rubber plantation ecosystem is about 1.53, and the average value of CUE (carbon use efficiency) is 0.35. This indicated that Re takes a large proportion in GEP, but NEE a small proportion. In rubber plantation ecosystem, 65.4% of GEP is used for Re, 34.6% for NEE (i.e. carbon sequestration). In the 65.4% ecosystem respiration, 37.1% is used for soil respiration, 62.9% for vegetation respiration. In this study biomass inventory and eddy covariance are combined for mutual verification to study systematically the carbon balance process of the rubber plantation system. The carbon storage and the NEE in the rubber plantation system were calculated, and environmental driving factors and control mechanisms were analyzed, which can provide a good example of carbon balance research for other tropical plantations. The carbon balance process of the rubber plantation system was first systematically studied, which can evaluate the carbon sink benefits of the rubber plantation system scientifically, and provide basic data for government decision-making and carbon trade, and theoretical basis for rubber plantation management.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): ecosystem respiration (Re)
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
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Zhixiang WU. "A large carbon sink in the rubber plantation ecosystem based on five years’ observation in Danzhou, Hainan, South of China". ไม่ระบุหน่วยงาน. ม.ป.ป.

Zhixiang WU. "A large carbon sink in the rubber plantation ecosystem based on five years’ observation in Danzhou, Hainan, South of China". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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A large carbon sink in the rubber plantation ecosystem based on five years’ observation in Danzhou, Hainan, South of China
Zhixiang WU
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
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