Planting Eucalyptus not necessarily linked with the Southwest Drought

State Forestry Administration afforestation Secretary Wang Zhu Xiong said at the meeting, and further give full play to our country's institutional advantages, urging all to seize the rainy season, fall planting, according to the characteristics of tree planting organization throughout the year.

Against it because of eucalyptus planting too many problems caused by drought, Wang Zhu Xiong explained that extensive research by experts and scientific analysis, sustained low rainfall, high temperature, evaporation is the formation of the direct causes of dry southwest. The atmospheric circulation anomalies is the fundamental reason for planting eucalyptus and the arid Southwest are not necessarily linked. Less precipitation is too few exceptions, is not less general. September 2009 -2 010 years, most of the precipitation in March arid Southwest generally less than 200 mm; temperatures unusually high, since September last year, most of the climate in Southwest 1-2 degrees higher than the normal year. Droughts can last longer. Generally arid regions of southwestern persistent drought over six months to more than 8,9 months, which is the root cause, another major factor, the direct cause.

WANG Zhu-Xiong, said, with scientists saying that "the atmospheric circulation anomalies are the underlying causes of severe drought in Southwest China." Southwest arid mainly by dry and warm air control, influence precipitation in the region, the main weather system what is it? Is India, Myanmar and low pressure over the same period is significantly lower than normal activities. Some popular again, said that the warm air can not get inside the region in several provinces of Guangxi, is the problem of atmospheric circulation.

Wang Zhu Xiong explained, eucalyptus trees should say on this I think it is not harmful in itself, but there are many benefits. Eucalyptus has been introduced in our country over 120 years of history, originating in Australia, Indonesia and Philippines, our country has introduced small in size. Eucalyptus has the following characteristics:

First, rapid growth, can quickly provide timber, also can improve the ecological benefits. According to expert data, Brazil is a world of artificial eucalyptus longer the best country, can grow year amounted to 7,8 cubic meters per mu accumulation, our country look good in Hainan, which can each Model Forest acre per year up to 4 cubic meters, which is very high.

Second, this tree rotation is short, usually 5-7 years and the shortest 3-4 years you can spend up to address the current problems with the use of materials and materials better. This relatively drought-resistant trees, Low, ecological benefits are obvious, are often in the green hills of ecological restoration as a pioneer species in the absorption of greenhouse gases, carbon sequestration, climate regulation has a role. According to expert determination, eucalyptus carbon sequestration per hectare per year to reach 8 tons, this species is good.

Wang Zhu Xiong, for example, eucalyptus planted in our country at 2.6 million hectares the total area of about figure in our national forest resources, which account for how much weight it? According to the Seventh National forest inventory results, we state the total plantation area is about 62 million hectares, accounting for eucalyptus plantation acreage is only 4.19%. Eucalyptus cent of our total forest area is 1.3% of the country, while 80% of Eucalyptus found in our country, Guangdong, Guangxi and Hainan, Fujian, and other like Yunnan, Sichuan, Chongqing is also part of the distribution. Please Guangxi Chiang engineer while the specific answer to this question, his deeper feelings there. We conducted a survey in some places, but also expert diagnosis, we have a serious drought in the area is not the focus of local eucalyptus, or the proportion of planted eucalyptus is small. Therefore, the scientists concluded: forest as the main terrestrial ecosystems, to improve the local microclimate. But for large scale regional or global climate, including the impact of precipitation is minimal.

Wang Zhu Xiong said that eucalyptus planting in the arid regions of southwestern forest area less than 1% of the entire region, if the impact of dry eucalyptus was not the case at least, more precisely, at least not this understanding of science. The water use efficiency of Eucalyptus species in the relevant comparison of which is the highest, but water consumption is not the highest. According to scientific data such as measured, eucalyptus water per one kilogram of dry matter production, water consumption 785 l of eucalyptus, pine water 1538 l, eucalyptus harvest unit of water consumed by only 51% of pine. Description of its water use is very good.

Wang Zhuxiong Jiang emphasized that, also, is not a deep root system of Eucalyptus, it is not a threat to groundwater, even now, some people can not be said that "pump" concept. I have and forestry, ecology, communication academicians had, any kind of plant they say, as long as the plants grow on land need to absorb water, while the air which also evaporate water, which depends on the plant water use efficiency is not high, there is no plant which is the "pump", which plant is the "raw water machine." In fact, this species of eucalyptus trees with the other has the same ecological effect as a soil and water conservation, the role of carbon sequestration and oxygen release, and just said, compared with the pine trees, water use efficiency but also better, so we must be objective, impartial, scientifically understand eucalyptus.


Jiang Guixiong added that, from our local situation, drought and species of Eucalyptus does not necessarily linked. Our eucalyptus few dry areas in Guangxi, where Eucalyptus species are not dry. Baise, Hechi these two relatively large area of forest land, eucalyptus area less than 3%. From my own experience in terms of forestry work, eucalyptus is a good species, ecological functions of strong economic function is also very strong, planted the trees in the southern region is the solution to our national security is to maintain the place of wood ecological safety of the hero of tree species. Guangxi's wood production now accounts for one seventh of the eucalyptus played a big role. Some of our county in the development of Eucalyptus Instant Forest ago, a county forest timber production less than 5 million cubic meters, is to develop, adopt each year to 200,000 or even 30-40 million cubic meters. Without this species of eucalyptus, our country's wood shortage will exacerbate the situation, the absence of eucalyptus in the south of this tree species, ecological condition, forest cover will also be greatly affected. So called on the media a comprehensive, objective information to this species of eucalyptus.