Effects Of Decomposing Cinnamomum Camphora Tree Leaf Litter On Capsicum Annuum And The Allelopathic Effects Of Kalium

Under the background of thedevelopment of agroforestry system, further study of camphor litterdecomposition of leaf undergrowth of receptor plant allelopathy, to establish a camphor forest-food compound management system is of great significance. This experiment adopts the pot experiment, combining with single factor randomized trialdesign.Research the effects ofdecomposing leaf litter of Cinnamomum camphor a on growth of Impatiens balsamina and in the process of litterdecomposition of leaf kalium for relief of allelopathy effect. Each pot contained 8 kg soil mixed withdifferent amount of leaf litter (0 g·pot^-1, CK; 25 g·pot^-1, L25; 50 g·pot^-1, L50; and 100 g·pot^-1, L100) respectivly.35d after sowing, eachdealing with randomly selected five basins, in the litter leaf processing on the basis of K ?K2CO3 analysis pure? processing, each basin total into the 0.1 g. Respectively as KCK, KL25, KL50 and KL100. Respectively in 40d after sowing anddetermination of chili after 60d morphological characteristics, resistance of photosynthetic and physiological indexes; 50d weredetermined after planting soil available nitrogen and soil microbial biomass C and N. The results of the study are as follows:1.Litter camphor leaves add significantly reduces the pepper plant height and biomass ?P<0.05?, and with the increase in the amount of litter leaves added, enhanced inhibition. Plant height and biomass compared with the CK adrop of about 27.67%?48.37% and 17.21%?61.67%. K after litter leaf of hot pepper plant height and biomass of inhibition.2.Litter camphor leaves treatment on pepper produced obvious low levels of photosynthetic pigment content promote high inhibition effect?P<0.05?, four types of pigment affected thedegree of close. Compared with CK, the amount of chlorophyll L50 processing [chlorophyll ?a+b?], chlorophyll a ?Chla?, chlorophyll b ?Chlb? and carotenoid?Car? content increased by 22.52%,22.52%,18.44% and 22.52% respectively ?P<0.05?, whereas L100 processing of leaf chlorophyll ?a+b?, Chla, Chlb and Car contentdecreased by 22.10%,22.10%,21.82% and 22.10% respectively ?P<0.05?.K after the photosynthetic pigment content are compared in the litter leaves only high treatment group, indicated that the measures to effectively alleviate the litter camphor leaves inhibition of photosynthetic pigment pepper.3.With the increase of litter camphor leaves, pepper leaf in the hydrogen peroxide content increased significantly ?P<0.05?.The 40d receptor plants significantly lower activity of superoxidedismutase ?SOD?, peroxidase ?POD? activity increased, the activity of catalase ?CAT? slightly increases, malondialdehyde ?MDA? there was no significantdifference; 60d SOD activity than CK, POD activity less than CK, the CAT activity is greater than CK, but lower than 40d, MDA rise significantly.In the camphor litterdecomposition of leaf soluble sugar ?SS? content and nodifference between the CK.40d when the content of soluble protein ?SP? and nodifference between the CK and SS contentdecreased significantly when 60d, may be proteins and reactive oxygen species ?ROS? reaction. Results show that the litter camphor leaves under the stimulus of chili produce large amounts of ROS in the body. When is grown and 40d plant the positive response of the antioxidant enzymes in the leaves, effectively avoid the peroxidedamage caused by excessive ROS; At 60d pepper leaf antioxidant enzymes in reaction against excessive ROS. K,differences between the SS and SP, the accumulation of H₂O₂ is not obvious, chili three antioxidant enzyme positive response of the blade, makes the finaldid not significantly increased, MDA content reduced membrane peroxidationdamage.4.Soil NO₃^--N content increased with the increase of litter leaf content graduallydecreased ?P<0.05?, adrop of about 42.89%?77.78%, and NH₄⁺-N content as litter leaves increased with the increase of adding amount of. Soil microbial biomass nitrogen ?MBN? content and CK nodifference ?P>0.05?. Soil microbial biomass carbon ?MBC? is significantly lower than that of CK ?P<0.05?. Results indicate that allelochemicals may be affected by the soil microbial community, soil enzymes affect soil nutrient process effectively, thus affecting the receptor plant nutrient supply effectively, and inhibit the growth anddevelopment. K content of soil NO₃^--N after compared to just add a litter treatment significantly reduced.To sum up, litter camphor leavesdecompose releasing allelochemicals role in soil in chili, through affecting the nutrient absorption and penetration balance, inhibit the synthesis of photosynthetic pigment, induction of active oxygen increased, lead to increased MDA content in order to inhibit the growth of pepperdevelopment; And k can effectively relieve part of litter on pepper allelopathy. Therefore, in the management of crops and forests compound camphor should remove too much litter, and a moderate amount of k fertilizer reduce its allelopathic effect.