1) mineral nitrogen accumulation
矿质氮累积
1.
Two methods,one for determing residual urea (RU) and one for determing mineral nitrogen accumulation (MNA) were used for measuring urea hydrolysis rates in soils,and a comparison of the results was made under aerobic and waterlogged incubation conditions.
分别用测定残留尿素(直接法)和矿质氮累积量(间接法)的方法,测定了土壤的尿素水解速率,并比较通气培养和淹水培养期间尿素水解的异同。
2) mineral element contents
矿质积累
1.
Through filling the mine subsided area with coal fly ash and covering with 60 cm compound soil mixed with coal fly ash, the physiological functions and mineral element contents of Festuca arundinacea grown in reclaimed area with coal fly ash were studied.
对高羊茅生长发育、生理功能和矿质积累的研究结果表明 :含 30 %以下粉煤灰复合土能提高高羊茅植株光合作用和氮素利用能力 ,促进植株生长 ,不会对植株产生伤害 ;当复合土中粉煤灰含量达 4 0 %时 ,高羊茅光合作用、蒸腾作用和氮素利用能力降低 ,细胞膜脂质过氧化水平升高 ,膜透性增大 ,SOD、POD和CAT活性降低 ,植株生长被抑制 ;随着复合土中粉煤灰含量的升高高羊茅植株Mn、Zn、Ca、Mg的质量分数升高 ,Cu的质量分数无显著变化 。
4) nitrogen accumulation
氮素积累
1.
Effects of nitrogen fertilization on nitrogen accumulation of seeds and shell in rapeseed cultivar Yangyou 4(Brassica napus L.);
施氮对油菜籽粒和果壳中氮素积累的影响
2.
Characteristics of nitrogen accumulation and its relationship with root growth of rice after transplanting;
水稻栽后植株氮素积累特征及其与根系生长的关系
3.
Effects of nitrogen application at different developmental stages on nitrogen accumulation and translocation in winter wheat
不同时期追氮对冬小麦植株氮素积累及转运特性的影响
5) Water and nitrogen accumulation
水氮累积
6) nitrogen accumulation
氮素累积
1.
Effect of nitrogen applied levels on the dynamics of biomass,nitrogen accumulation and nitrogen fertilization recovery rate of cotton after initial flowering;
氮素水平对初花后棉株生物量、氮素累积特征及氮素利用率动态变化的影响
2.
Genotypic variation of nitrogen accumulation and translocation in japonica rice(Oryza sativa L.)cultivars with different height;
不同株高粳稻氮素累积和转运的基因型差异
3.
The results showed that the dry weight or nitrogen accumulation and nicotine accumulation of each leaf position and of the whole plant had an increasing trend as nitrogen application increased within certain ranges in Jinsha, and they remained basically unchanged when the nitro.
K326)为试验材料,在大田条件下,研究了不同供氮量对烤烟生长、氮素累积和烟碱累积的影响,为优质烤烟生产提供一定的理论依据和技术指导。
补充资料:茶树根系吸收矿质元素
茶树根系吸收矿质元素
absorption of mineral elements by the root system of tea plant
茶树根系吸收矿质元素、absorption()fmineral elements by the root systemof tea Plant)茶树根系从土壤和水中吸收离子状态元素的过程。根系对矿质元素的吸收是一个生理过程.受到内外因素的形响。 茶树根系是吸收矿质元素的主要器官。茶树根系吸收矿质元素以根尖为多,离幼根尖端2一3匣米处礴的移动l为最大。根毛部是根尖吸收矿质离子最活跃的区城。根系吸收矿质离子有被动吸收和主动吸收(或主动运拍)。被动吸收不需要代谢供能,包括扩散、离子交换吸附,杜南(Donnan)平衡:主动吸收是靠细胞代谢供能而递浓度差吸收矿质离子。矿质离子从根部表面进入木质部有两条途径:一是经共质体的主动运愉;二是经质外体从内皮层进入共质体到中柱。一般说来,主动吸收是根系吸收矿质的主要形式。 茶树根系对矿质的吸收受年龄、生育期、代谢强弱、修剪等的形晌。成龄茶树的吸收利用率.氮是50%,确是22.5%,钾是45%。幼龄茶树分别为25%、4%、7.5%。在全年中,氮和钾的吸收主要集中在4一11月:礴则集中在4一6月和9月,各占总吸收最的均%和38%。茶树修剪后一个月左右,根系对氮、碑、钾的吸收还在减少,氮和钾的吸收恢复较快,恢复后,以对氮的吸收为最迅速。 土坡条件影响茶树根系对矿质的吸收。①土坡水分和氧气:土坡通气良好,氧气充足,CO:浓度减少,呼吸增强,促进根系生长和对水、肥的吸收;土坡水分过多,氧气缺乏,CO:浓度增高,抑制有筑呼吸,降低根系对矿质的吸收。土城水分不足,限制矿质盐类的溶解;燕腾速率降低,亦阻碍矿质离子向上运愉。因此.土坡水分常控制或促进茶树对矿质元素的吸收、利用。②上城溶液浓度:在一定范围内,根系吸收矿质元素的数量随施肥t的增加而提高,但超过一定量时,离子载体与矿质离子结合达到饱和,根系吸收矿质离子不再增加。祁门茶叶研究所多年研究表明:梅5()0克氮可收获鲜叶25千克左右.亩产鲜叶一吨左右.年施氮以20一30千克为宜.超过30千克,虽能提高产量.但利用率不高。③土城沮度:根系吸收矿质随土沮升高而加快,以25一30℃为宜。沮度过高或过低都抑制根系对矿质元素的吸收。④土坡pH:宜茶的土城pH为4.5一6.5,以pHS.2一5.6最好。一般说来,阳离子的吸收随上坡pH上升而增加,阴离子的吸收随pH的上升而降低。
说明:补充资料仅用于学习参考,请勿用于其它任何用途。
参考词条