In this paper,five factors causing waterlogging in the lowland polder area s of southern china are listed and reviewed based on the field ecosystem of waterlogging:climate,topgraphy and morphography,soil,hydrology and geology and human activities.

從農(nóng)田漬害生態(tài)系統(tǒng)的角度綜述了我國(guó)南方低洼圩區(qū)產(chǎn)生漬害的五大成因：氣候因素亚洲黄色在线观看网站、地形地貌因素、土壤因素欧美一区二区在线网站观看蜜臀、水文地質(zhì)因素和人為因素免费黄色网址直接进入；在分析南方各地治理漬害經(jīng)驗(yàn)的基礎(chǔ)上，概述了目前改造和防治漬害低產(chǎn)田的七大措施：搞好水利工程建設(shè)国际a片播放，實(shí)行水旱輪作欧美精品中文字幕在线视频，加強(qiáng)耕作管理，增施有機(jī)肥料78摸免费人成视频在线观看，利用抗?jié)穹N質(zhì)資源国产AAA免费黄色视频，噴施外源生長(zhǎng)調(diào)節(jié)劑及應(yīng)用高分子技術(shù)。

Owing to the planting and fertilizing,the proportions of soilavailable K,nonexchangeable K and mineral K in soil total Kcontent has changed.On different soils,this change have differenttendency.

由于人為的耕作和施肥免费人成a，供試土壤中的速效鉀欧美性爱精品店、緩效鉀和礦物鉀在土壤全鉀中的比例發(fā)生了相應(yīng)變化，且兩種土壤的變化不一樣黄色视频一、二、三区。

Most symbioses are obligate, as are some nonsymbiotic mutualisms, such as those formed by fungus-farming ants.

大多數(shù)共生者是專(zhuān)性共生人人干人人射视频，還有一些非共生性的互利共生也是專(zhuān)性的，如蘑菇-耕作蟻之間的互利共生午夜福利120。

More than 100 species: tropical and subtropical Asia; pantropical in cultivation; 80 species (67 endemic) in China, mainly in the south and southwest.

超過(guò)100種：熱帶和亞熱帶的亞洲操东北妇女视频；在耕作過(guò)程中泛熱帶色播影院性播影院午夜私人影院；在中國(guó)的80種(67特有)，主要在南方和西南方亚洲色图精品录音。

After the losses took their toll, Aden had a new pithily of thoughts, why not stop farming the marginal land and set it aside for wildlife.""

后損失了他們的收費(fèi)熟女乱伦91视频一区，亞丁了新pithily思路，為什么不停止耕作的邊際土地激情无码色欲毛片，并將它設(shè)置預(yù)留野生動(dòng)物全免费A级毛片毛片。&&

I make no doubt but that there are potentially, if I may use that pedantic word, many Bacons,Locks, Newtons, Caesars, Cromwells, and Marlboroughs at the ploughtail, behind counters, and, perhaps, even among the nobility; but the soil must be cultivated, and the season favourable, for the fruit to have all its spirit and flavour.

我毫不懷疑一级片黄片视频，完全有&潛在的可能&（如果我可以使用這個(gè)學(xué)究氣的詞語(yǔ)）很多農(nóng)田耕作的国产一线天精品视频，柜臺(tái)后面的，甚至是在豪門(mén)貴族中的人日韩黄色网站AV，都有可能成為培根們农村一级黄色毛片网站，洛克們，牛頓們真人交，凱撒們国产在线一区二区三区麻豆，克倫威爾們和馬爾伯勒們，但前提是土壤必須要勤耕2022韩国限制级电影在线观看，季節(jié)要適宜日韩视频第一区，果實(shí)才能具有全部的品質(zhì)和風(fēng)味。

I make no doubt but that there are potentially, if I may use that pedantic word, many Bacons, Locks, Newtons, Caesars, Cromwells, and Marlboroughs at the ploughtail, behind counters, and, perhaps, even among the nobility; but the soil must be cultivated, and the season favourable, for the fruit to have all its spirit and flavour.

如果允許我用&潛在的&這個(gè)學(xué)究味濃重的詞的話(huà)www.rct999.com，我們并不懷疑在農(nóng)田耕作国产另类重口调教在线，在柜臺(tái)后經(jīng)營(yíng)的人，甚至在豪門(mén)貴族中間有很多潛在的培根們黑人粗大猛烈进出高潮视频，洛克們欧美国产第页，牛頓們，愷撒們黄片免费有限，克倫威爾們和馬爾伯勒們欧美VA免费播放；但是要使果實(shí)具有它全部的品質(zhì)和風(fēng)味，還不許有耕耘過(guò)的泥土手机日韩精品第一页在线观看免费高清，必須有適宜的季節(jié)11孩岁女精品A片男。

Culture improves, and occasions elicit, natural talents I make no doubt but that there are potentially, if I may use that pedantic word, many Bacons, Lockes, Newtons, Caesars, Cromwells, and Mariboroughs at the ploughtail behind counters, and, perhaps, even among the nobility; but the soil must be cultivated, and the season favourable, for the fruit to have all its spirit and flavour.

文化修養(yǎng)改良了天賦，機(jī)遇環(huán)境誘發(fā)了天賦18禁女性裸体啪啪免费网站。我們并不懷疑在農(nóng)田耕作中韩欧美视频二区，在柜臺(tái)后營(yíng)業(yè)，甚至在豪門(mén)貴族中間有很多潛在的培根們超碰97在线观看免费观看完整版、洛克們久久无码午夜体验区、牛頓們、凱撒們色色色色色色色色色色色色色色色综合、克倫威爾們和馬爾伯勒們色人妻综合，如果允許我用&潛在的&這個(gè)學(xué)究味濃重的詞的話(huà)91精品视频在线观看免费视频；但是要使果實(shí)具有它全部的品質(zhì)和風(fēng)味，還必須有耕耘過(guò)的泥土国产成人亚洲第一站AV，必須有適宜的季節(jié)国产美女一级视频。

By high density sampling and farming household investigation,total N content,microbial biomass N content,total N and MB-N relationship,and N cycle characteristics and N balance of plowable soil layer under different land-use types were studied in Dongting Lake region.

通過(guò)對(duì)洞庭湖典型地區(qū)的密集采樣分析和農(nóng)戶(hù)調(diào)查，研究了4種利用方式耕作土壤全N国外激情视频免费、微生物生物量氮含量黄色视频啪啪一区、兩者關(guān)系和N素循環(huán)特征。

The comparison of pollen contents inside and outside the rice field and in the dust indicates that the Poaceae pollen content of 36％ or higher is much likely related to rice cultivation development,even if human activities have strong impacts on the double-crop paddy areas.

稻田內(nèi)外樣品和塵土花粉結(jié)果的對(duì)比分析表明免費的歐美黃色網站，在人類(lèi)強(qiáng)烈干擾的雙季稻耕作區(qū)www.国产精品久久久久久，禾本科含量達(dá)到36％以上時(shí)，很可能表明與稻作農(nóng)業(yè)發(fā)展有關(guān)欧美一区欧美一区。