Influences Of Different Treatments On Soil Conditions And Plant Physical And Physiological Characters

Recent years, many new cultivars with high adaptability and ornamental value are introduced as street trees in order to improve ecological benefits, improve bio-diversity, and creat significant seasonal landscape. So the introduction and acclimatization of street tree cultivars is an important subject to study.In this paper, Acer 'Autum Blaze', Acer 'Paciflic Sunset' , Acer rubrum 'Red Sunset' and Liriodendron 'Aureomarginatum' were selected as experimental trees, and Zeolite, peat, edible fungi wastes and K-PAM were selected as soil amendments. Based on varied weight ratios, the four materials were combined into different sorts of mixed soil conditioners. The effects of different treatments on soil conditions and plant physio-chemical properties had been studied. The results were as follows:1) The results indicated that soil amendments helped to improve soil fertility and plant growth process. Generally speaking, compared with control group, the treatments reduced soil bulk density and pH value, enhanced soil porosity, EC value, nutrition contents, and also, increased plant hight, DBH , single leaf area , single leaf weight, SLW, leaf chlorophyll, carotenoids and OPC contents.2)The influences of different treatments, trees and indexs were different. To some extend, it had the same trend in both field and pot experiments. So the soil actual state, trees growth habits and their interactions are the consideration factors when soil amendments were selected.3)Compared with other treatments, K-PAM could significantly decrease soil bulk density and increase soil porosity. In pot experiment, the effect of high concentration K-PAM treatment was better than middle and low concentration K-PAM.4)Treatment "Zeolite+peat" could distinctly decrease soil pH, and the effect was popular in different tree species. Treatment "Zeolite+peat", "Zeolite+ edible fungi wastes" could enhance soil EC value. According to this study, soil EC value demonstrated a significant positive correlation with soil hybridized N.5) Correlation analyses showed that it was positive correlation between any two indexes of soil organic matter, hybridized N, available phosphorus, TN, TP, TK. Treatment "Zeolite+peat" and treatment "Zeolite" could largely enhance soil nutrition contents. There was no identical rule among treatments "K-PAM" of different concentrations.6)The influence of treatment "Zeolite+peat" in plant hight, DBH , single leaf area , single leaf weight was remarkable; And for SLW, treatment "Zeolite+ edible fungi wastes" was the most effective. In the pot experiment, treatment "Zeolite+ edible fungi wastes" and treatment "K-PAM" could largely increase plant SLW. There was no identical rule among treatments "K-PAM" of different concentrations.7)In pot experiment, treatment "Zeolite+peat", treatment "Zeolite+ edible fungi wastes" and treatments "K-PAM" of high concentrations were the most good at increasing leaf chlorophyll and carotenoids contents.8) The relationship between SLW and leaf chlorophyll content was significant positive correlated, so the soil amendments which could increase leaf chlorophyll content could also increase SLW. This had important leading meaning for the usage of soil amendments.9) Compared with other treatments, leaf OPC contents changed rulelessly after different treaments. So it would be necessary to furtherly study how to effctively enhance leaf OPC contents in some season for increasing the landscape benefits.