本文選題：鹽堿土 + 灘涂圍墾　； 參考：《江蘇農(nóng)業(yè)學報》2017年04期

【摘要】：為探明灘涂新圍墾區(qū)不同鹽分水平土壤的鹽分季節(jié)性變化規(guī)律的差異性,以及土壤鹽分與土壤因子之間的關(guān)系,2014年5月-2015年5月,在江蘇省沿海灘涂圍墾區(qū),設(shè)置不同鹽分水平(低鹽,含鹽量0.1%~0.2%;中鹽,含鹽量0.5%~0.7%;高鹽,含鹽量1.0%以上)的田間試驗,監(jiān)測了土壤電導率(EC1∶5)和土壤因子(0~40.0 cm)的季節(jié)性動態(tài)變化。結(jié)果表明:(1)高鹽土壤鹽分具有明顯的季節(jié)性變化規(guī)律,表現(xiàn)為6-8月雨季土壤EC1∶5降到最低值2.54 d S/m,9-12月積鹽作用明顯,且在10月EC1∶5達到最大值6.49 d S/m;中鹽土壤鹽分具有一定程度的季節(jié)性變化規(guī)律,表現(xiàn)為在10-12月具有明顯的積鹽效果,且在10月EC1∶5達到最大值3.90 d S/m;低鹽土壤鹽分沒有明顯的季節(jié)性變化規(guī)律。(2)不同鹽分水平下,土壤水分和pH1∶5值(除高鹽土壤外)均沒有明顯的季節(jié)性變化規(guī)律。(3)灘涂圍墾地區(qū),在0-40.0 cm土層中,土壤EC1∶5與pH1∶5值之間有極顯著的負相關(guān)(P0.01),而與土壤水分含量和土壤溫度均沒有明顯的相關(guān)性。總之,該地區(qū)土壤鹽分水平越高,雨季土壤表層脫鹽越明顯,秋季和初冬季節(jié)積鹽越明顯。因此,在灘涂圍墾區(qū)農(nóng)業(yè)利用時,應在雨季前(3-5月)或秋季前(8-9月)采取人為措施(如秸稈覆蓋等),加速土壤降鹽或控鹽,以達到農(nóng)作物生產(chǎn)的要求。
[Abstract]:In order to find out the difference of the seasonal variation of soil salinity and the relationship between soil salinity and soil factors in the new reclamation area of tidal flat, from May 2014 to May 2015, in the coastal tidal flat reclamation area of Jiangsu Province,In October, the EC1:5 reached the maximum value of 6.49dS / m, and the salt content in the medium salt soil showed seasonal variation to a certain extent, which showed that the salt accumulation effect was obvious in October and December.In October, the maximum value of EC1:5 was 3.90dS / m; the salt content of low-salt soil had no obvious seasonal variation.Soil moisture and pH1:5 value (except for high-salt soil) have no obvious seasonal variation rule. 3. In the 0-40.0 cm soil layer, there is no obvious seasonal variation rule.There was a significant negative correlation between soil EC1:5 and pH1:5, but no significant correlation with soil moisture content and soil temperature.In a word, the higher the soil salt content in this area, the more obvious the surface layer desalination in rainy season, and the more obvious the salt accumulation in autumn and early winter.Therefore, artificial measures (such as straw mulch, etc.) should be taken before rainy season (3-5 months) or autumn (August to September) to accelerate soil salt reduction or salt control so as to meet the requirements of crop production.
【作者單位】： 江蘇沿江地區(qū)農(nóng)業(yè)科學研究所;江蘇省如東縣氣象局;
【基金】：江蘇省自主創(chuàng)新基金探索性項目[CX(14)5096] 南通市科技項目-應用基礎(chǔ)研究項目(MS12016047)
【分類號】：S156.4

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