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water-stable
    Study on the Effects of PVA on the Formation of Soil Water-stable Crumbe
    聚乙烯醇形成土壤水稳性团粒的效果研究
    The higher the inoculation rate,the higher the hyphal desity. Mycorrhizal hyphal contribution to the formation of water-stable soil aggregates of 5~2 mm was 100% within the distance of 4~6 cm from the root surface,however not within the distance of 0~2 or 2~4 cm.
    (3)2~1mm粒径团聚体在土壤水稳性团聚体构成中占有绝对比重,菌根菌丝对距根表不同距离处2~1mm团聚体形成的贡献率均在70%以上,但距根表2~4cm处菌根菌丝贡献率明显低于0~2、4~6cm处,并未表现出随菌丝密度增加而提高的趋势;
    POC was found to accumulate in water-stable aggregates larger than 2mm in size and to decrease sharply with the decreasing size.
    >2mm水稳性大团聚体中的POC对施肥的响应较为敏感,以化肥与秸秆配施下该粒径水稳性团聚体中POC的积累效果最为明显。
    Furthermore,POC in >2mm water-stable aggregates was significantly higher under chemical fertilization plus straw return,while POC in those of 2-0.25mm and 0.25-0.053mm in size slightly higher under chemical fertilization plus pig manure,indicating a higher sensitivity of POC in larger aggregates to fertilization practices.
    而化肥与猪粪配施则显著增加了2~0.25mm和0.25~0.053mm水稳性团聚体中的POC含量。
    Regression coefficients showed a possible source of POC in water-stable aggregates from increased crop biomass in topsoil(0-5cm) and organic matter applied in sub-surface layer(5-15cm).
    土壤不同层次水稳性团聚体中POC的来源不同,在0~5 cm表层可能主要来源于作物根茬生物量,而在5~15 cm土层则可能跟施入的外源有机物有关。
    Mass of >0.25 mm water-stable aggregate is 23.8%-45.4%. Percentage of aggregate destruction(PAD) ranges from 52.4% to 66.8%,showing a poor aggregate stability. Ari-Sandic Primosols have the highest PAD.
    >0.25mm的水稳性团聚体变动在23.8%~45.4%,团聚体破坏率(PAD)为52.4%~66.8%,团聚体组成和特征有利于抵抗土壤风蚀,但稳定性差,灌溉后易于分散、沉实板结、通透性差。
    Effect of Crystal Organic Fertilizer on Water-stable Aggregates and Micro-structure of Soils
    结晶有机肥对土壤水稳性团粒组成及微结构的影响
    Relationships between water-stable aggregates and nutrient status in black soil after reclamation.
    黑土开垦后水稳性团聚体与土壤养分的关系
    (2) the content of water-stable aggregates (>0.25 mm) and the rate of soil structure damage was in an order of 3330 Caragana/ha < natural grassland < 2490 Caragana/ha < 1665 Caragana/ha.
    ②>0.25mm的水稳性团聚体含量3330丛/hm~2柠条林<天然恢复草地<2490丛/hm~2柠条林<1665丛/hm~2柠条林;
    It is found that soil structure is significantly influenced by clay and organic matter in the soil. Statistic analysis shows that soil structure coefficient is positively correlated with soil clay content, and that 1—0.05 mm microaggregate, 10—0.25mm water-stable aggregate and its mean geometric diameter value are obviously correlated with organic matter content in soil.
    土壤粘粒、有机质,尤其是后者对土壤结构状况影响很大,土壤结构系数与土壤粘粒含量呈显著正相关,土壤1—0.05mm粗微团聚体含量、10—0.25mm水稳性团聚体及其几何平均直径值,均与土壤有机质含量呈显著正相关。
    And the stand has better soil structure character and has stronger nutriment supply ability, total content of >0.25mm Water-stable soil aggreagate of 0-20 cm top soil is 9.99 % highter than that of Chinese fir plantation and organic materials of 0-20 cm top soil is 0.695 % higher than that of Chinese fir plantation.
    与杉木人工林相比,栓皮栎人工林具有良好的土壤结构和较强的养分供应能力。 其表层土壤>0.25mm水稳性团聚体含量比杉木人工林高9.99%,土壤有机质含量比杉木人工林高0.695%。
    no-tillage is helpful for forming water-stable crumb bigger than0. 25 mm.
    免耕有利于>0.25mm水稳性团粒的形成。
    Two AM fungi contributed 100% to the formation of 5~2mm water-stable aggregates.
    菌根菌丝对土壤中 5~ 2 mm水稳性大团聚体形成的贡献为 10 0 % ;
    for the average content of >0.25 mm soil water-stable aggregates within the depth of 0~60 cm,the content of natural restoration is bigger than that of natural restoration with artificial measures,the content gradually increases with increasing abandoned times,and the changes of the content of different vegetation types is not obvious,but the changes of that in different soil layers is very evident.
    对于0~60cm土层>0.25mm土壤水稳性团聚体含量,自然恢复>自然+人工恢复,随着恢复年限的不断增长,其含量不断增加,而不同植被类型作用下的土壤水稳性团聚体含量变化不明显,但是其含量在不同土层变化差异较大。
    The results showed there are great differences in content of water-stable aggregates(>0.25 mm) under different tillages.
    结果表明:不同耕作条件下,大于0.25 mm水稳性团聚体的含量差异较大。
    Correlative analysis indicated content of soil water-stable aggregates(>0.25 mm) is in high correlation with content of organic matter of soil and yield of corns,and their correlative coefficients are 0.860 and 0.703 respectively.
    相关分析表明,大于0.25 mm的水稳性团聚体含量与土壤有机质含量及作物产量呈显著相关,相关系数分别为0.860和0.703。
    There is abundant radily nutrient in the locust×sea-buckthorn mixed forest,and there are a mass of clay and water-stable aggregate which is ≥0.25mm in it.
    其中刺槐×沙棘混交林地速效养分丰富,粘粒和≥0.25mm水稳性团聚体的数量大;
    The results showed that,all three types of macromolecule polymers have significant effect of improving soil physical properties. Compared with the control,the content of water-stable aggregate and the soil permeability increased by 17.27% and 41.81% respectively,and the soil bulk density decreased by 11.18% and the ability of holding water increased by 2.8 times.
    结果表明:1)3种高分子聚合物均是较好的土壤结构改良剂,经聚合物处理后的土壤水稳性团粒含量平均增加17.27%,渗透性能提高41.81%,密度减小11.18%,土壤持水能力较对照提高2.8倍。
    The results show that: In terms of vegetation succession stages,the contents of big gravel soil water-stable aggregates increased,the >5 mm aggregate is priority in different layers,about 50%~80%.
    结果表明:随着植被演替,土壤中大粒级水稳性团聚体含量逐步增加,>5 mm粒级团聚体在土壤团粒结构中占主导地位,含量占50%~80%。
    The results show that: In terms of vegetation succession stages,the contents of big gravel soil water-stable aggregates increased,the >5mm aggregate is priority in different layers,about 50%-80%.
    结果表明:随着植被演替,土壤中大粒级水稳性团聚体含量逐步增加,>5mm粒级团聚体在土壤团粒结构中占主导地位,含量占50%~80%。
 

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