With adjacent semi-moving dune as the control, this paper studied the effects of 5-, 10- and 22-year old Hedysarum fruticosum plantations on the nutrient status, microbial biomass, and enzyme activities at the soil depths 0-10, 10-20 and 20-30 cm.

以半流動(dòng)沙丘為對(duì)照，對(duì)5、10和22年生山竹巖黃蓍人工固沙群落不同層次（0～10、10～20 和 20～30 cm）土壤的養(yǎng)分狀況、微生物生物量和土壤酶活性進(jìn)行了對(duì)比研究700AV在线视频。

G.E. Hubb has abundant toots and high yield, and the time when Eulaliopsis binata G.E. Hubb growths fast is as the same as the time of the rainy season in this area, so Eulaliopsis binata Retz.

蓑草根系發(fā)達(dá)，地上部生物量大欧美一级片亚洲三级片，對(duì)土壤的覆蓋保護(hù)好狼友首页一区二区三区，且其生長(zhǎng)盛期與降雨高峰同步，具有顯著的水土流失防治效果亚洲玖玖在线第一页。

In chapter 6, the foraging behaviour, biomass allocation and reproductive characteristics of Humulus scandens which grow under different nutrient supply were studied.

第六章以攀援植物葎草為材料亚洲小说图片网，探討了在不同養(yǎng)分供應(yīng)水平下植株的覓食行為、生物量分配以及繁殖特性一级黄色变态在线视频。

The results indicated that vegetation biomass had a significant positive relationship with vegetation coverage. They had a significant negative correlation with bulk density of soil, and a positive correlation with macroaggregate, water stability macroaggregate, organic matter content, total nitrogen content, hydrolyzable nitrogen content, available kalium content, microbial biomass, and microbial respiration. However, they had no significant relationship with total phosphorus and available phosphorus.

在其恢復(fù)過程中欧洲黄片免费看，植被地上生物量與植被覆蓋度呈正相關(guān)，它們與土壤容重呈負(fù)相關(guān)丝袜脚交在线观看无码，而與土壤大團(tuán)聚體亚洲色成a在线网、水穩(wěn)性大團(tuán)聚體、有機(jī)質(zhì)含量台湾高清精品一二三四、全氮含量无国产A片马上打开、水解氮含量、速效鉀含量国产一级二级视频在线、微生物量以及土壤呼吸強(qiáng)度之間呈正相關(guān)性激情大迟度床上视频一区二区，與土壤全磷、速效磷含量無(wú)顯著相關(guān)性黄色.com。

Hygrophilous species disappeared partly, and disturbance-resistant species and exotic species expanded their populations in the tourism area;(2) the community structure of bryophytes on the fir trunks in the tourism area was found simpler than that in the undisturbed area; and (3) the trunk at height of 120~180cm was more susceptible to disturbance, but the base was not affected signif icantly by disturbance.

在旅游活動(dòng)頻繁地段，耐蔭喜濕物種局部消失欧美乱图，耐干旱抗干擾的植物種群擴(kuò)大日韩三级电影网；(2)旅游活動(dòng)頻繁地段樹干附生苔蘚植物的豐富度、蓋度和生物量較未擾動(dòng)地段腥蘸拦患杜访酪患丁欧美高清黄色；(3)距地面較高的高度120cm和180cm處受到的干擾強(qiáng)度最大，基部的影響較小特殊黄色网。

And then analyze the characteristic of a hypaethral quarry and some ecological and environmental impact brought by opencast working. Such as some familiar pollute source, harms brought by opencast working: botanic reakage, water pollution, edaphic reakage, water and soil loss, biomass reduce.

然后對(duì)露天采石場(chǎng)的特點(diǎn)以及開采造成的生態(tài)環(huán)境影響進(jìn)行分析a片手机在线一级一区，如一些常見的污染源欧美性交操B，開采造成的危害：植被破壞、水體污染久久有精品、土壤破壞国产成人午夜福利影片在线播放网站、水土流失、生物量減少等wwwaa在线观看。

The results showed that biomass of Eucalyptus exserta stands were increscent with the increasing of stand age.It was 2.77 t/hm2 in the stand of 0.7 year and was 70.932 t/hm2 in the stand of 7.7 years.

結(jié)果表明第一福利在线观看，窿緣桉林分的生物量是隨著林分年齡的增長(zhǎng)而增加，即由造林初期(0.7 a生)的2.77 t/hm2增加到主伐期(7.7 a生)的70.932 t/hm2免费看男人女人A片。

In this paper,the effect of the compound stress of Cu,Cd,Pb,Zn and As on the growth and the accumulation and the distribution of heavy metals in Juncus Effuses is researched by using soil cultures method.

盆栽試驗(yàn)結(jié)果表明：Cd美国操逼网站、Pb、Cu欧美丰满熟妇XXXX公交车爱爱、Zn呦女网址、As 5種重金屬?gòu)?fù)合脅迫對(duì)燈心草地上部生長(zhǎng)有一定程度的抑制作用，在土壤環(huán)境質(zhì)量二級(jí)標(biāo)準(zhǔn)上限值處燈心草地上部生物量減產(chǎn)9婷婷久久香蕉五月综合加勒比。

The yield of biomass of the ground part of Juncus Effuses growing on the soil polluted by wastewater or tailings of Lead/Zinc mining decareasd by 28.23% or 37.1% respectively, but the activities of POD, SOD and CAT were all higher than those in CK.

生長(zhǎng)在礦毒水和鉛鋅尾礦污染土壤中的燈心草地上部生物量分別下降28.23%和37.1%欧美性交AAAA免费，但POD、SOD和CAT 3種酶活性均高于對(duì)照好大好深好猛好爽免费视频。

We also inoculated cottonwood clone 895 with 6 ectomycorrhizal fungi. It was found that Xerocomus chrysenteron, Lactarius insulsus and Boletus edulis accelerated seedlings generation from cuttings of clone 895 more than the other fungi did, and they remarkably promoted seedling growth comparing with the control. Lactarius insulsus promoted above-ground biomass and root system most effectively.

接種南林－895楊的6種菌根真菌中中文字幕永久永久在线，紅絨蓋牛肝菌、劣味乳菇操逼色图亚洲、美味牛肝菌可促進(jìn)南林－895楊扦插苗提早萌芽春雨直播视频观看完整版高清，處理120 d后能顯著促進(jìn)南林－895楊苗的生長(zhǎng)，與對(duì)照比較差異顯著亚洲欧美一区第一页，其中劣味乳菇對(duì)楊苗生物量影響最大免费高清性色毛片A片，其接種試驗(yàn)苗根系最為發(fā)達(dá)。