保护性耕作模式对黑土有机碳含量和密度的影响
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“十一·五”国家科技支撑课题(2006BAD15B01;2006BAD02A14)


Effects of conservation tillage patterns on content and density of organic carbon of black soil
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    摘要:

    以公主岭市长期(10 a)保护性耕作定位试验为研究对象,分析与传统耕作模式相比的几种保护性耕作模式对黑土固碳效应的影响。共设4种耕作模式,即秋翻秋耙匀垄、秋灭茬匀垄、全面旋耕深松和宽窄行交替休闲(又叫松带、苗带交替休闲)(后3种视为保护性耕作)。结果表明,经过10 a的耕作试验,不同的耕作模式对土壤有机碳有显著的影响。表层0~20 cm秋翻秋耙匀垄和秋灭茬匀垄模式的土壤有机碳含量最低,深层30~50 cm全面旋耕深松模式的土壤有机碳质量分数显著低于其他耕作模式13.49%~25.14%;0~50 cm耕层中宽窄行交替休闲的土壤有机碳质量分数高于其他耕作处理0~33.58%。宽窄行交替休闲模式下的宽窄行松带活性有机碳质量分数及缓性有机碳质量分数分别高于其他模式8.06%~48.87%和0~33.83%。全面旋耕深松模式与宽窄行交替休闲模式下的宽窄行苗带土壤有机碳密度分别低于和高于秋翻秋耙10.95%、17.13%;>20~50 cm宽窄行苗带的活性有机碳密度及缓性有机碳密度分别高于其他耕作模式2.20%~18.85%和17.00%~29.19%,不同耕作模式的土壤惰性有机碳密度没有显著性差异。相对秋翻秋耙的传统模式,不同的保护性耕作模式能够增加土壤有机碳密度也能够降低土壤有机碳密度,宽窄行交替休闲主要通过增加土壤活性有机碳及缓性有机碳密度来增加其土壤有机碳密度,是东北地区固定土壤有机碳、提高土壤有机碳质量的有效耕作方式。

    Abstract:

    Based on the long-term (10 years) conservational tillage experiment in Gongzhuling city, the effects of minimal tillage patterns (MTs) and conventional tillage pattern (CT) on soil sequestrated carbon were analyzed. Four tillage patterns were designed as follows: fall moldboard plowing and harrowing ridge (called as CT); fall stubbing ridge (called as MT1); deep loosing tillage (called as MT2); wide-narrow row alternation fallow (called as MT3), the last three minimal tillage patterns were regarded as conservation tillage patterns. Results showed that different tillage patterns had a significant effect on the soil organic carbon for a 10 years tillage experiment. CT and MT1 had the lowest soil organic carbon content in the surface layer (0–20 cm); organic carbon content of MT2 pattern was significantly 13.49%–25.14% lower than that of other tillage patterns in deeper layer (30–50 cm); organic carbon content of MT3 was 0–33.58% higher than that of other tillage patterns. Active and slow organic carbon content of loosing belt of MT3 was 8.06%–48.87% and 0–33.83% higher than that of other patterns, respectively. Soil organic carbon density of MT2 pattern and seeding belt of MT3 pattern was 10.95% lower and 17.13% higher than that of CT; active and slow organic carbon density of seeding belt of MT3 in 20–50 cm was 2.20%–18.85% and 17.00%–29.19% higher than that of other tillage patterns; passive organic carbon density of different tillage patterns had no significant variance. In contrast to CT, different conservation tillage patterns could increase soil organic carbon density or reduce soil organic carbon density. MT3 pattern increases soil organic carbon density through the increasing of soil active and slow organic carbon density, which is the most beneficial tillage pattern for soil organic carbon sequestration and quality improvement of soil organic carbon in northeast region.

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吕贻忠,廉晓娟,赵 红,刘武仁.保护性耕作模式对黑土有机碳含量和密度的影响[J].农业工程学报,2010,26(11):163-169.

Lü yizhong, lian xiaojuan, Zhao Hong, Liu Wuren. Effects of conservation tillage patterns on content and density of organic carbon of black soil[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE),2010,26(11):163-169.

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  • 收稿日期:2010-01-07
  • 最后修改日期:2010-09-28
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