固氮

However,the soil moisture content at soil depths of 45 cm and 60 cm in the areas with microbiotic crusts is much lower than that in the areas without microbiotic crusts(LSD-test,p.05),which reveals that the microbiotic crusts have high capability of maintaining topsoil moisture.

在世界干旱区的大量研究表明，作为荒漠生态系统的重要成分，生物结皮的形成能够增强土壤抗风蚀及水蚀的能力〔3~8〕、增强其周围维管植物的养分循环〔9~11〕、通过生物固氮提供丰富的氮源〔12〕、促进种子库的建立和生物多样性等。

Further study of the interaction between NodD and naringenin by FRET technology is underway.

通过对naringenin分子上六个不同位点，不同性质，长度连接链以及母体和荧光团之间两种连接方式的11个荧光标记物的合成以及生物活性评价，我们找到了一个荧光标记物，它保留了野生型naringenin约20％的活性，并将其用于根瘤菌固氮过程的研究，发现该荧光标记物能够顺利进入根瘤菌活细胞中，为下一步通过FRET技术研究naringenin和NodD蛋白之间的相互作用打下了基础。

The discovery of N2 fixation within the leaf-cutter ant-microbe symbiosis reveals a previously unrecognized nitrogen source in neotropical ecosystems.

这种切叶蚁与微生物之间的共生固氮体系的发现，揭示了一类存在与新热带生态系统中先前没被发现的氮来源

After the selection from one to three generations, several mutants were obtained. The major mutants included non-nodule mutants (18 lines) which failed to nodulate after inoculated with rhizobia for two weeks, ineffective nodulation mutants (9 lines) which had less uneven and white or transparent nodules, an abnormal leaf and flower mutant which was dwarf without stipules, abnormal flowers and less nodules, and a slender mutant with a thin stem and smaller leaves.

从种植的三代植株中，筛选到多种共生固氮根瘤的突变体，其中不结根瘤突变体18个株系，表现为接种根瘤菌两周后无根瘤形成；结无效根瘤突变体9个株系，表现为根瘤数目少且分布不均匀，根瘤呈白色，有些为半透明；花叶形态异常突变体1个株系，表现为除根瘤数目少外，植株矮小、托叶消失、花形态异常；纤细突变体1个株系，表现为除根瘤数目少外，植株变小、茎细叶小。

Nodulation experiments showed that both soybean and alfalfa were nodulated by XJ96077 effectively.

交叉结瘤试验发现，它既可以在苜蓿上又能在大豆上结瘤固氮。

Seed yield, nitrogen accumulation and BNF by nodulated soybeans growing in a very P-deficient soil increased dramatically with P inputs.

在非常缺磷的土壤上生长的结瘤大豆的籽粒产量、氮积累量和生物固氮量均随增加磷的投入显著增加。

Uriede-N in the xylem sap of nodulated soybean has been positively correlated with N2 fixation activity of nodules (Herridge 1984).?

结瘤大豆木质部汁液中酰脲-N与根瘤固氮活性具正相关(Herridge 1984)。

Sinorhizobium fredii 042BS was isolated from root nodules of alfalfa from Xinjiang Region. Nodulation experiments showed that both soybean and alfalfa were nodulated by 042BS effectively.

费氏中华根瘤菌042BS分离自新疆的苜蓿根瘤，交叉结瘤试验发现它既可以在苜蓿上又能在大豆上结瘤固氮。16S rDNA PCR-RFLP分析表明，042BS与费氏中华根瘤菌模式菌株USDA205的4种限制性酶切图谱完全一致。

The swainsonine mainly originated from the metabolism of Oxytropis endophyte, and its concentration was related with the nitrogen fixation of nodule, but not genetic characteristics.

棘豆中苦马豆素主要来源于内生菌的代谢产物，其含量与根瘤菌固氮作用有密切关系，而与遗传无关。

The 0-40cm soil layer soil mean value looked that mixes by the interlacing broadcasts the lawn soil ulmin, the alkaline hydrolysis nitrogen content to be highest; The fast-acting phosphorus, the fast-acting potassium are highest by the unicast awnless brome lawn content; The colleague mixes broadcasts lawn pH to be biggest.

无芒雀麦对土壤要求不严，耐贫瘠、严寒，耐碱性也较强，需氮较多，适宜与紫花苜蓿、沙打旺、野豌豆、百脉根、红三叶等豆科牧草混播，借助豆科牧草固氮作用，促进无芒雀麦良好生长[4]。本实验就是无芒雀麦单播草地和与紫花苜蓿混播草地对土壤理化性质的影响进行比较。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。