1) plantation degradation
人工林退化
2) artificial forests in rehabilitated land
退耕地人工林
1.
Carbon storage of artificial forests in rehabilitated lands in the upper reaches of the Yellow River;
黄河上游退耕地人工林的碳储量研究
3) land capability decline of plantation
人工林地力衰退
1.
The results of study on the land capability decline of continuous cropping of Larix and Cunninghamia lanceolata showed that the imbalance of bio_cycle and improper cultivation technology were the main causes of land capability decline of plantation.
人工林地力衰退主要表现为土壤剖面逆向发育 ,土壤理化性质变差 ,有机质和养分状况恶化 ,人工林生产力下降等。
4) deteriorate pasture
退化人工草地
1.
The results showed that for the deteriorate pasture, the first restrict factor was phosphorus and the second was potassium.
采用 N、P、K三因素肥料试验研究了氮磷钾肥配施对退化人工草地的增产效应以及土壤养分含量的影响。
2.
Effective fertilization was studied by fertilizer experiment in red soil deteriorate pasture.
通过肥料试验 ,对红壤退化人工草地的合理施肥技术进行了研究。
5) Forest degradation
森林退化
1.
As one of the most critical environmental problems in the 21st century, forest degradation has been facing worldwide.
森林退化可以理解为森林面积减少、结构丧失、质量降低、功能下降;森林衰退则是森林退化的一种形式,指森林(树木)在生长发育过程中出现的生理机能下降、生长发育滞缓、生产力降低甚至死亡,以及地力衰退等状态。
2.
Forest degradation,forest management,devegetation and revegetation are several additional direct human\|induced activities under the Kyoto Protocol 3 4 Their definitions are closely connected to the carbon accounting methodologies and the greenhouse gases (GHGs) emissions and removals of these activities,for which they are the key issues concerned by IPCC and UNFCCC.
森林退化、森林管理、植被破坏和恢复是涉及《京都议定书》第 3条第 4款 (3。
3.
The change of soil enzyme activity and relationship between enzyme activity and soil nutrient content during the process of forest degradation were studied to provide the theoretical basis for revegetation in Karst region with the frail ecosystem.
为给喀斯特环境脆弱生态系统的植被恢复提供理论依据,对贵州中部喀斯特森林退化过程中土壤酶活性的变化及其与土壤养分含量的相关关系进行了研究。
6) degraded forestland
退化林地
1.
Characteristics of vegetations and soil nutrients on subalpine degraded forestlands in Northwest Yunnan;
滇西北亚高山不同退化林地植被与土壤养分特征
2.
In the paper,species composition,species density,dynamic change,and impacts on vegetation regeneration of soil seed pool are introduced;and countermeasures for forest regeneration in degraded forestland by means of soil seed pool are proposed.
提出了利用土壤种子库进行退化林地植被恢复应采取的措施。
补充资料:人工林
人工林
man-made forest
rengong}in人工林(~-made forest)以人工方式形成的森林。造林方式可分为直播(种籽)造林、植苗造林、分生造林、飞机播种造林和人工促进天然更新等。 根据考古资料,中国人工造林始于新石器时代,有文字记载的不晚子周代。世界林业发达国家大面积营造人工林已有2(X)年以上的历史。据统计,20世纪80年代初全世界人工林面积己有1 .40亿公顷。中国大面积人工林的营造是在中华人民共和国建立后开始的,到目前止,人工林保存面积达2 146余万公顷,蓄积量达41670万立方米(参见彩图插页第52页)。 人工林的经营目的明确,造林地和树种选择,林分空间结构和造林技术,以及抚育措施都是由经营者按其经营目的决定的。人工林与天然林相比,有如下特点:①按经营目的选择造林树种,其森林更符合人们的需要。②一般为同龄林,林相整齐。③森林树种组成较少,层次结构较单纯。④个体的水平分布均匀,布局较合理。⑤森林个体分化程度相对较小,但个体与群体的矛盾比较突出。⑥生产周期较短,比较速生丰产。 由于天然林的过度采伐,致使木材供应紧张和生态环境恶化,人们不得不大量营造人工林来弥补森林的不足。但人工林的大量发展,已暴露出不少问题,如森林稳定性差、病虫害严重、地力衰退等。它关系到人工林持续发展的大问题,因此,已引起世界各国林学家的极大关注。一般来说,人工林地力衰退 人工林毛白杨 (《中国国土 画册》)主要是树种选用不当,对立地条件不适应,以及人为管理方法不善的结果。为此,需要采取一系列综合措施,包括抗性育种、混交间作、施肥改土及必要的生物和化学防治措施等,关键还在于建立一个具有结构比较复杂、良性循环的稳定的人工林生态系统(参见彩图插页第52页)。(赖世登)
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参考词条