| Effects of tillage measures on soil structure and organic carbon of surface soil in sem-i arid area of the western Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2008.04.11 |
| Key Words: conservation tillage loess plateau soil structure organic carbon |
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| Abstract: |
| Field experiments were conducted in Dingxi on the western Loess Plateau to investigate the effects of conservation tillage on soil structure and organic carbon of surface soil in the rainfed farming system．The results showed that soil bulk density kept steady in no-tillage with straw cover （NTS） compared to conventional tillage （T） conventional tillage with straw incorporated （TS） and no-tillage （NT）．Soil total porosity was lowest in NTS but NTS increased ＞30μm pores content by3．605％ 4．749％ 3．338％ in W→P→W rotation sequences and2．834％ 4．023％ 2．728％ in P→W→P rotation sequences compared with T NT and TS respectively． As far as water stable macroaggregates（＞0．25 mm） was concerned it was 7．412％,9．493％,9．098％ and 10．577％ in W→P→W rotation sequences and 7．600％,10．027％,8．085％ and 9．933％ in P→W →P rotation sequences for T NT TS and NTS respectively．At the same time soil organic carbon in NTS was9．227g／kg and 9．353g／kg being 0．958g／kg and 1．045g／kg higher than that of conventional tillage in two rotation sequences respectively．That is to say NTS can improve topsoil total organic carbon which failed to be affected by NT or TS independently. |