With methods of limited areas, root systems of plant individuals were limited in a specific range, providing definite spatial boundary and solid basis for calculation of water requirement needed by plant individuals. On the basis of calculation of amount of water requirement, areas needed by every species to ensure enough water requirement are as follows: Populus simonii is 80.3m〓, Ulmus macrocarpa is 35. 4m〓, Artemisia halodendron is 7. 0m〓, Salix gordejvii is 11. 2m〓. Prunus armeniaca is 15. 2m〓, and Caragana microphylla is 15. 6m〓. The corresponding rational density of plantation which can maintain soil water balance and can ensure plantation stability is 125 individuals/ha for Populus simonii, 285 individuals/ha for Ulmus macrocarpa, 625 individuals/ha for Prunus armeniaca, 625 individuals/ha for Caragana microphylla, 833 individuals/ha for Salix gordejvii, and 1428 individuals/ha for Artemisia halodendron, respectively.

運(yùn)用有限面積法將植物根系限制在明確的邊界內(nèi)搜锁一个能看的毛片网站，為植物耗水量的計算提供了一個明確的空間邊界范圍和可靠的基礎(chǔ)国产亚洲第3页，探索性和嘗試性地得出了近似野外真實狀態(tài)下植物個體的耗水量国亚洲视频，以此為基礎(chǔ)計算得出小葉錦雞兒日韩免费午夜毛片视频在线播放、山杏、黃柳,入级性交片、差巴嘎蒿超碰97公开免费在线、榆樹、楊樹等樹種的水分營養(yǎng)面積分別是15.6m〓、15.2m〓美女视频黄色网、11.2m〓18禁止看黄色av、7.0m〓、35.4m〓和80.3m〓欧美在线888，與此對應(yīng)的能夠維持林地土壤水分平衡和林分穩(wěn)定性的各樹種人工林的合理密度為：楊樹125株/公頃免费看黄片片，榆樹285株/公頃，杏樹625株/公頃日韩爱色成人片在线观看视频网站，小葉錦雞兒625株/公頃国产精品欧美一区，黃柳833株/公頃，差巴嘎蒿1428株/公頃色综合久久综合网88。

The results showed that Mg application considerably alleviated Mg-deficient symptom and increased magnesium nutrition on leaf of shatian pumelo; while soil in the orchard contained medium K and lack of Mg, yield and plantation income of shatian pumelo comparatively increased by 1.2% 18.7% and 0.4%~24.7% at the level of the amount of potassium oxide 340.2 kg/hm^2 applying Mg 22.5 kg/hm^2 and 45.0 kg/hm^2 while yield and plantation income of shatian pumulo comparatively increased by 11.2% 31.7% and 11.7%~39.4% at the level of the amount of potassium oxide 453.6 kg/hm^2 applying Mg 45.0 kg/hm^2, 81.0 kg/hm^2 and 117.0 kg/hm^2, and fruits quality was improved as well.

結(jié)果表明在线无码你懂的视频网站，施鎂可明顯減輕沙田柚葉片的缺鎂癥狀，提高葉片鎂素營養(yǎng)国产区你懂得；在土壤有效鉀含量中等2022最新无码国产自在线视频，有效鎂含量缺乏的情況下，施用鉀肥(K2O) 340.2 kg/hm^2基礎(chǔ)上配施鎂肥 22.5及45.0 kg/hm^2又粗又长又硬又爽的少妇毛片，果實產(chǎn)量提高1.2%~18.7%欧美性爱教学视频，種植效益提高0.4%~24.7%；施用鉀肥(K2O) 453.6 kg/hm^2基礎(chǔ)上配施鎂肥 45.0无码一级在线观看视频、81.0及117.0 kg/hm^2人妻论坛，果實產(chǎn)量提高11.2%~31.7%，種植效益提高11.7%~39.4%无码A级毛片免费视，同時柚果品質(zhì)得到改善。

Except total potassium and quick-acting phosphorus, every target in nitrogen fixation plantation was higher than that in non-nitrogen fixation plantation.

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In China,the land resources that can be used to produce material for liquid fuels are:plantation field of sorghum and maize that can be substituted by sweet sorghum,winter idle field in South China,sloping landthat is needed to convert into forest, oil plant forestry land,and in-support plantation land.

我國能夠用來種植能源作物和能源植物的土地資源主要有甜高粱替代高粱和部分玉米的耕地www.色综合,com、南方冬閑田、退耕還林的土地成人影院蜜桃传媒在线播放、油料林地中国老熟女BBWXXXX、和后備土地。

Self-thinning mechanism and climate reactions of growth of Chinese fir plantation are theoretical basic forsustainable management and development of Chinese fir plantation.

杉木人工林自然稀疏機(jī)制與生長的氣候響應(yīng)是杉木人工林持續(xù)經(jīng)營的理論基礎(chǔ)69视频在线，對于指導(dǎo)林業(yè)生產(chǎn)具有重要意義日本AAAAA级婬片A片AAAAAA。

Using quadratic orthogonal rotation design,this paper establisheda mathematical model of density change during self-thinning for Cunninghamia lanceolata plantation,and theinner law of density change during self-thinning for Cunninghamia lanceolata plantation were analyzed.

進(jìn)一步應(yīng)用數(shù)量化理論I分析杉木人工林自疏過程密度變化與環(huán)境因子間的相互關(guān)系，確定影響杉木林自疏過程密度變化的主要環(huán)境因子為海拔、坡位和林分平均胸徑国内偷拍第一视频区，從而為杉木林自疏機(jī)制的定量描述提供了依據(jù)97理论理论午夜免费。

The water, soil, light, thermal resources are abundant in Shihezi and the surrounding areas, possessing over 10 million mu of arable land, annual sauce-use tomato plantation is 200 thousand mu, meanwhile large amount of red pepper, safflower, marigold and other economic crops planted here, so plantation area can be extended in accordance with the demand.

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The resulted that there was an obvious rhizosphere effect in all growing years of Caranaga microphylla plantation. The pH value of rhizosphere soil was lower than those of near rhizoshphere soil at different growing years. The content of organic matter, total N and available K in rhizosphere soil were all higher than those in near rhizoshphere soil, but the content of Olsen-P in 5-age plantation was remarkably deficient in rhizosphere soil.

對不同生長年限的小葉錦雞兒人工灌叢根際土壤變化規(guī)律研究表明欧美性人成三级视频，根際土的pH均小于根外土：土壤有機(jī)質(zhì)欧美黑人日韩一级视频在线观看免费、全氮、速效鉀在根際土中均有一定程度的富集現(xiàn)象日韩在线综合自拍视频网站免费；而5年生的小葉錦雞兒根際土的有效磷含量出現(xiàn)了虧缺成年欧美1313www色。

Comparing guild composition reveals a food resource view of the difference between each landscape: grassland landscape supports proportionally more shrub insectivores than other landscapes; conifer plantation landscape supports more ground feeders and also shrub insectivores; natural forest landscapes support bole insectivores that almost never inhabit conifer plantation nor grassland.

以生態(tài)同功群探討不同地景所能提供的食物資源差異，發(fā)現(xiàn)草生地地景能承載較多的灌層蟲食者亚洲全网黄色网站、人造針葉林地景擁有較多的地面覓食者與灌層蟲食者在线视频产自拍、天然林地景擁有的樹干蟲食者則幾乎不出現(xiàn)在其他地景內(nèi)；然而數(shù)量最多的樹層覓食者在各地景間差異不明顯理论片235影院。

Fertilizer and irrigation programs used and banana yields obtained in the Toledo plantation, Santa Marta, Colombia from 1989 to 1992. and Fig.4 Number of harvested bunches/ha, number of exportable boxes/ha and ratio boxes/bunches in the Toledo banana plantation, Santa Marta, Colombia as an increment in the number of bunches harvested, number of hands per bunch, weight of individual bunches and total number of exportable boxes.

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