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首页> 外文期刊>Plant and Soil >Effects of white clover (Trifolium repens L.) on plant and soil nitrogen and soil organic matter in mixtures with perennial ryegrass (Lolium perenne L.).
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Effects of white clover (Trifolium repens L.) on plant and soil nitrogen and soil organic matter in mixtures with perennial ryegrass (Lolium perenne L.).

机译：白三叶草（Trifolium repens L.）对多年生黑麦草（Lolium perenne L.）的混合物对植物和土壤氮及土壤有机质的影响。

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摘要

Relations between crop and soil parameters were studied in a cutting trial in 1992-95 in Wageningen, Netherlands, with perennial ryegrass (Lolium perenne) cv. Condesa and Bartlet monocultures and ryegrass-white clover (Trifolium repens) cv. Alice, Retor and Gwenda mixtures. All plots were cut 7 times in 1992. The monocultures were cut twice in 1993 and 1995 and three times in 1994, while the mixtures were cut six times in 1993 and 1995 and five times in 1994. The grass monocultures had very low drymatter (DM) yields (<2.1 t ha-1) and a low N concentration in the harvested herbage. During 1992-95 the annual herbage DM yield in the mixtures ranged from 7.0 to 14.3 t ha-1, the white clover DM yield from 2.4 to 11.2 t ha-1 and the mean annual clovercontent in the herbage DM harvested from 34 to 78%. Mixtures with the large-leaved clover cv. Alice yielded significantly more herbage and clover DM and had a higher clover content than mixtures with small/medium-leaved cv. Gwenda and Retor. Grass cultivar did not consistently affect yield, botanical composition or soil characteristics. The apparent N2 fixation was very high, ranging from 150 to 545 kg ha-1 in the different mixtures. For each tonne of clover DM in the harvested herbage, 49 to 63 kg N was harvested, while the apparent N transfer from clover to grass varied between 55 and 113 kg N ha-1 year-1. The net N mineralization rate was lower under monocultures than under mixtures. The C mineralization and the amounts of C and N in active soil organic matter fractions were similar for monocultures and mixtures, but the C:N ratio of the active soil organic matter fractions were higher under grass than under mixtures. This explains the lower N mineralization under grass.
机译：1992-95年在荷兰瓦赫宁根的一次cutting割试验中，使用多年生黑麦草（Lolium perenne）cv对作物与土壤参数之间的关系进行了研究。 Condesa和Bartlet单一栽培和黑麦草白三叶草（Trifolium repens）简历。爱丽丝，雷托和格温达的混合物。在1992年，所有土地被砍伐了7次。在1993年和1995年两次砍伐了单一栽培种，在1994年砍了3次，而在1993年和1995年砍伐了六种混合物，在1994年砍掉了五次。 ）的产量（<2.1 t ha-1）和收获的牧草中的低氮浓度。在1992-95年间，混合物中的牧草DM的年产量为7.0至14.3 t ha-1，白三叶草的DM产量为2.4至11.2 t ha-1，收获的牧草DM的平均年三叶草含量为34％至78％ 。与大叶三叶草简历的混合物。爱丽丝生产的牧草和三叶草DM明显多于具有小/中叶简历的混合物的三叶草含量。 Gwenda和Retor。草品种并没有持续影响产量，植物组成或土壤特性。在不同混合物中，N2的表观固着力非常高，范围从150到545 kg ha-1。对于收获的牧草中每吨三叶草DM，收获了49到63 kg的氮，而从三叶草到草的表观氮素传递在55 ha和113 kg N ha-1 year-1之间变化。单培养的净氮矿化率低于混合培养的净矿化率。单培养和混合土壤中活性土壤有机质部分的碳矿化和碳，氮含量相似，但草中的活性土壤有机质部分的碳氮比高于混合土壤。这解释了草下较低的氮矿化。

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