連續(xù)14年保護(hù)性耕作對(duì)土壤總有機(jī)碳和輕組有機(jī)碳的影響
[Abstract]:Based on the experiment of planting conservation tillage in the semi-arid rain-fed agricultural area of Longzhong Loess Plateau in 2001, five kinds of conservation tillage (no-tillage straw mulch, NTS, no-tillage NT, traditional tillage straw rotation and burying TS,) were determined in 2014. Changes of total organic carbon (SOC) and light organic carbon (LFOC) before and after crop growth period in wheat and pea double sequence rotation (0 ~ 5 ~ 5 ~ 5 ~ 10 ~ 10 ~ 10 ~ 10 ~ 10 ~ (30) cm) and conventional tillage T treatments under conventional tillage and no-tillage film mulching (NTP) and conventional tillage T treatments. The results showed that soil total organic carbon (TOC) and light organic carbon (LOC) in soil profile decreased with the increase of soil depth. Compared with traditional tillage, Tns and TS could significantly increase the content of SOC,LFOC in 0 ~ 30 cm soil layer, and increase the content of SOC,LFOC by 19.51% and 13.36% 42.08% and 28.00%, respectively, compared with T before sowing. 85.37% and 18.61% and 77.82%, but there was no significant difference in SOC,LFOC content between NT and TP treatment and T treatment. From the time before sowing to after harvest, the content of SOC in 0 ~ 30 cm soil layer decreased, among which NTS and TS treatments changed the least, NT and TP treatments increased the consumption of SOC and LFOC during the growing period of crops. LFOC can sensitively reflect the change of soil organic carbon. Therefore, it is beneficial to the accumulation of carbon and the improvement of soil quality to carry out conservation tillage with no-tillage and straw mulch in this area, and to promote the sustainable development of agriculture in this area.
【作者單位】: 甘肅省干旱生境作物學(xué)重點(diǎn)實(shí)驗(yàn)室甘肅農(nóng)業(yè)大學(xué)農(nóng)學(xué)院;甘肅農(nóng)業(yè)大學(xué)資源與環(huán)境學(xué)院;
【基金】:國(guó)家自然科學(xué)基金(31460337) 隴原青年創(chuàng)新人才扶持計(jì)劃 甘肅省干旱生境作物學(xué)重點(diǎn)實(shí)驗(yàn)室開放基金(GSCS-2010-03)
【分類號(hào)】:S153.6
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