It is concluded, therefor, that reserving broad-leaved tree in Chinese fir plantation benefit the conservation of biodiversity that deserves wide-spreading.

說明栽杉留闊經(jīng)營(yíng)模式有利于生物多樣性的保護(hù)，應(yīng)值得大力推廣毛片视频a毛片。

Casuarina equisetifolia, introduced abroad into China in 1950s, has been showing good adaptability and high productivity. It play an important role in wind break and sand fixation, ameliorating ecological environment and offering timber along the southeast coast in China. To some extent, it has become one of the irreplaceable plantations in protecting plantation, particularly on the wind gap site.

木麻黃自從20世紀(jì)50年代引種到中國(guó)欧美色一区二区，在東南沿海地區(qū)已經(jīng)有50多年的栽培歷史，表現(xiàn)了很好的適應(yīng)性和豐產(chǎn)性黄片一级二级，在東南沿海建立了一道綠色的生態(tài)屏障久操免费在线观看，在防風(fēng)固沙黄页观看免费在线、改善生態(tài)環(huán)境和提供木材等方面發(fā)揮著巨大的作用，成為沿海地區(qū)造林的主要樹種之一AA片免费看，特別在海岸風(fēng)口地段的造林中具有不可替代的地位大伊人久久。

Plantation Economy and White Yeomanry Economy are the two main kinds of economic form of Ante-bellum Rural South in the United States.

內(nèi)戰(zhàn)前美國(guó)南部農(nóng)業(yè)經(jīng)濟(jì)包括黑人奴隸種植園經(jīng)濟(jì)和白人約曼經(jīng)濟(jì)兩種經(jīng)濟(jì)形態(tài)。

Pruning of different branch diameters was practiced in a 13-yr-old Taiwan Zelkova plantation, and then the pruned wound areas were coated with oil paint, lacquer, or CCA preservations or left untreated. The degrees of healing, discoloration, and decay on pruned wounds were examined 9 yr later.

櫸木人工林在13年時(shí)另类性交在线，進(jìn)行不同枝徑之修枝a大乳日韩人妻无码网站，隨后并以油漆、透明漆精品国产一区二区不卡、CCA防腐劑作傷口涂布欧美一区黄片，未涂布為對(duì)照組。22年生時(shí)欧美三级一级69，解析涂布之傷口Wwwav日韩黄色毛片，觀測(cè)其愈合，變色及腐朽發(fā)生情形国产国爽视频。

Of the collected specimens, Acarina, accounting for 52.21% of total collected individuals in natural forests and 38.59% in plantation-forests respectively, was the dominated group of soil invertebrate taxa in both natural forests and planted forests.

在天然林樣方中182個(gè)類群均有分布人人爱人人操av，而人工林中僅見89類群；土壤無脊椎動(dòng)物個(gè)體數(shù)方面天然林中共采集土壤無脊椎動(dòng)物原始個(gè)數(shù)90201頭性A片在线播放，而人工林中采集52222頭一级黄片免费视频。

Separately speeking, for outward rivers in Cansu (either to the Yellow River or to the Yangtze River), the allocable water resources are mainly the river runoff and groundwater, the priority sequence of water resources allocation would be: the water use for maintenance of local plantation including the environment-oriented and irrigated ones, water use for social and economic activities, and the runoff to lower reaches.

外流河流域的降水首先為當(dāng)?shù)氐闹脖缓挠茫Ｓ嗟牟判纬煽晒╅_發(fā)的地表徑流和地下水50岁女人一级A片免费；水資源配置的順序是：當(dāng)?shù)刂脖缓乃磺?dāng)?shù)厣鐣?huì)經(jīng)濟(jì)用水，最后形成干支流出境的徑流供中下游地區(qū)使用网上可看的欧美日皮大片网站。

Wood chemical compositions of 5-,8- and 11-yr -old Alnus cremastogyne plantations in the plantation area of F ujian Province are reported.

首次報(bào)道了四川榿木5、8和11年生3種樹齡木材的化學(xué)組分測(cè)定結(jié)果A女人黄色网站。

The results showed that slope form was the most important factor which influenced diameter, height and trunk's basic volume weight of Alnus cremastogyne from plantation and the slope with less than 45 degree influenced the diameter and height insignificantly.

結(jié)果表明亚洲中文字幕在线第一页，影響榿木人工林胸徑和樹干公定容重的首要地形因子是坡形，其次是坡向一区,二区,三区乱淫视频，再者是坡位欧美系列一级二级在线观看，而小于45°的坡度影響不顯著；影響榿木人工林樹高的首要地形因子是坡形7788色婷婷，其次是坡位色色色色色色色色片视频，再者是坡向，小于45°的坡度影響同樣不顯著一级毛片精品免费播放。

An orthoganal design with four terrain factors under two levels was carried out to systematically analyze the law of variation on diameter, height and trunk's basic volume weight of 13-year-old Alnus cremastogyne from plantation.

摘 要：本文應(yīng)用四個(gè)地形因子在兩個(gè)水平下的正交試驗(yàn)設(shè)計(jì)方法山东一级黄色大片，系統(tǒng)分析了13年生榿木人工林胸徑和樹高生長(zhǎng)以及樹干公定容重的變化規(guī)律。

The relationship between soil microbial biomass and soil organic C and respiration in three different agroforestry models, namely rubber tree + Amomum villosum, rubber tree + Coffea arabica and pure rubber plantation was investigated.

探討了橡膠與砂仁丁香婷婷五月综合、橡膠與咖啡間種和純橡膠林3種栽培模式下的土壤微生物生物量及其與土壤有機(jī)碳和土壤微生物呼吸強(qiáng)度的關(guān)系色色色资源。