介紹美國(guó)的英語(yǔ)作文帶翻譯
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Based on historical documents, modern survey and statistics, as well as the result of predecessor studies, the trend and main process of forest dynamics are recognized. The forest area and forest coverage rates for each province of China from 1700 to 1949 are es- timated backward by every 50 years. Linking the result with modern National Forest Inventory data, the spatial-temporal dynamics of Chinese forest in recent 300 years (AD 1700–1998) is quantitatively analyzed. The study shows that in recent 300 years, the forest area in current territory of China has declined by 0.95×108 hm2 (or 9.2% of the coverage rate) in total, with a trend of decrease and recovery. Before the 1960s, there was a trend of accelerated de- scending. The forest area was reduced by 1.66×108 hm2 (or 17% of the coverage rate) in 260 years. While after the 1960s, there has been a rapid increase. The forest area increased by 0.7×108 hm2 (or 8% of the coverage rate) in 40 years. The study also shows that there is a significant spatial difference in the dynamics of forest. The amplitudes of increasing and de- creasing in western China are both smaller than the ones in eastern China. During the rapid declining period from 1700 to 1949, the most serious decrease appeared in the Northeast, the Southwest and the Southeast, where the coverage rate in most provinces dropped over 20%. In Heilongjiang Province, the coverage rate dropped by 50%. In Jilin Province, it dropped by 36%. In Sichuan Province and Chongqing Municipality, it dropped by 42%. In Yunnan Prov- ince, it dropped by 35%. During the recovery period 1949–1998, the western provinces, mu- nicipality and autonomous regions, including Ningxia, Gansu, Inner Mongolia, Si- chuan–Chongqing, Yunnan, Tibet, Xinjiang and Qinghai, etc, the increase rates are all below 5%, while the eastern provinces, municipality and autonomous regions (except Heilongjiang, Hubei, Jiangsu–Shanghai) have achieved an increase over 5%, among which the Guang- dong–Hainan, Guangxi, Anhui, Beijing–Tianjin–Hebei, Shandong, Henan, Zhejiang, and Fu- jian have an increase over 10%.
根據(jù)歷史文獻(xiàn)、現(xiàn)代調(diào)查和統(tǒng)計(jì),以及前人研究的結(jié)果,這一趨勢(shì)和主要森林動(dòng)態(tài)識(shí)別的過(guò)程。每個(gè)省的森林面積、森林覆蓋率從1700年到1949年中國(guó)的es - timated向后每50年。連接結(jié)果與現(xiàn)代國(guó)家森林庫(kù)存數(shù)據(jù),中國(guó)森林的時(shí)空動(dòng)力學(xué)在最近300年(公元1700年- 1700年)是定量分析。研究表明,在最近的300年,森林面積在當(dāng)前中國(guó)境內(nèi)已經(jīng)下降了0.95×108款hm2(或9.2%的覆蓋率),減少和恢復(fù)的趨勢(shì)。在1960年代之前,有一個(gè)趨勢(shì),加速de -左右搖晃。森林面積減少1.66×108款hm2(或17%的覆蓋率)在260年。在1960年代后,迅速增加。森林面積增加了0.7×108款hm2(或8%的覆蓋率)在40年。研究還表明,存在著顯著的空間差異的動(dòng)態(tài)的森林。的振幅增加,de -壓痕在中國(guó)西部都是低于中國(guó)東部的。快速下降的時(shí)期從1700年到1949年,最嚴(yán)重的減少出現(xiàn)在東北,西南和東南,大部分省份的覆蓋率下降超過(guò)20%。在黑龍江省,覆蓋率下降了50%。在吉林省,下降了36%。在四川省和重慶市,下降了42%。云南箴言——因斯,下降了35%。復(fù)蘇期間1949 - 1998年,西部省份,μ- nicipality和自治區(qū),包括寧夏、甘肅、內(nèi)蒙古、Si - chuan-Chongqing,云南、西藏、新疆和青海、等,增加率都低于5%,東部省份,直轄市、自治區(qū)(除黑龍江、湖北、Jiangsu-Shanghai)實(shí)現(xiàn)了增加超過(guò)5%,其中光——dong-Hainan、廣西、安徽、京津冀、山東、河南、浙江、和傅——?jiǎng)σ呀?jīng)增加超過(guò)10%。
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