Effects of Different Organic Materials on Organic Carbon Loss,Heavy Metal Content and Rice Yield in Saline-alkali Mudflats
A field plot experiment was conducted to study the loss of organic carbon,the distribution of soil organic matter,and their effects on soil heavy metal content and rice yield under the same amount of organic carbon input of different organic materials ( CK,chicken manure T1 , sheep manure T2,mushroom residue T3,and biological humic acid T4) in mudflat saline alkali land.The results showed that after applying dif-ferent organic materials to the soil,the organic carbon loss rates of T1 ,T2 ,T3 and T4 were 64.52％,58.69％,47.04％,and 29.56％,respectively;the undisturbed portion was converted into soil organic matter.Although the T3 treatment had a lower organic carbon loss rate,the proportion of active organic matter in the soil was lower than other treatments.T3 and T4 could reduce the content of available mercury,arsenic,cadmium,lead and chromium in mudflat saline alkali soil,of which T4 was the best.T1 and T2 treatments could reduce the content of available mercury,cadmi-um and chromium,but to a certain extent,they could increase the content of available arsenic and available lead respectively.T1-T4 significant-ly increased the effective panicle and grain number of rice,with an increase of 10.17％,14.03％,6.65％ and 24.52％ compared to the control, respectively.Among them,T4 significantly increased the grain number of rice panicles.It could be seen that in the comprehensive improvement and utilization of mudflat saline alkali land,biological humic acid had significant advantages in terms of organic carbon loss rate,increasing soil active organic matter,reducing soil heavy metal content and improving rice yield,and was an excellent organic material input for the improve-ment of mudflat saline alkali land.
Mudflat saline alkali landOrganic carbon loss rateOrganic materialsHeavy metal contentRice yield
万方数据
维普
