| The waterside forest has a role in water purification. Playing various functions of urban forests and building efficient and healthy urban landscape forest is the inevitable demand of ecological environment improvement in the process of urbanization in China.Choosing two typical waterside forests as Bambusa chungii forest and camphor forest at Shihua mountain in Guangdong Province as the research object, by the typical sample-plot survey and the penetration test, this paper explores the purification of the material flow by simulating material flow with water as medium from the functional perspective of the material flow of landscape, to providing scientific basis for optimizing the relevant landscape structure of waterside forest. The results are as follows:All levels of nutrient reserves of forest landscape are abundant. There is different content of nitrogen, phosphorus and potassium in space of Vegetation layer of Bambusa chungii forest and camphor forest, and the relationship of different element can simulates by the linearregression model. The mainly characterized of N, P, K contents(g/kg) in various organs are in a decreasing order of N>K>P, among them, the old bambooleaf is in a decreasing order of N(19.58) >K(10.05) >P(0.96); the tender bambooleaf is in a decreasing order of K(17.61) >N(14.48) >P(1.32);the bamboo root is in a decreasing order of N(9.76)>K(3.76)>P(0.71);the old kuzuha is in a decreasing order of N(15.62)>K(8.16)>P(1.27);the tender kuzuha is in a decreasing order of N(16.30)>K(10.25)>P(1.37);the branch of camphor tree is in a decreasing order of N(5.49)>K(2.92)>P(0.50).The nutrition element(N,P,K) content of litter layer in Bambusa chungii forest ecosystem is in a decreasing order of N(12.66)>K(1.51)>P(0.53),and camphor forest ecosystem is in a decreasing order of N(10.93)>K(2.26)>P(0.61). The nutrition element(N,P,K) content of soil layer of Bambusa chungii forest and camphor forest ecosystem have a different characteristic which are in a decreasing order ofK >N>P.Specifically,the soil layer of Bambusa chungii forest ecosystem is in a decreasing order of(9.46)>N(3.38)>P(0.84), the soil layer of camphor forest ecosystem is in a decreasing order of K(23.32)>N(0.91)?P(0.86).Compared with atmospheric precipitation, the content of nutrition element(P,K,NH4+-N,SO42-) of through fall passed Bambusa chungii forest and camphor forest ecosystem respectively increase by 542.3%?690.7%?313.8%?0 and 900.5%?704.2%?-36.2%?-13.5%.As the result of sample-plot survey, the content of nutrition element(P,K,NH4+-N,SO42-) of sinking water from litter layer in Bambusa chungii forest is 583.3%?1236.1%?118.3%?68.7% of atmospheric precipitation, and camphor forest is-5.0%?729.4%?97.2%?13.5% of atmospheric precipitation. the content of nutrition element(P,K,NH4+-N,SO42-) of through fall passed the 60 cm soil of Bambusa chungii forest and camphor forest ecosystem respectively increase by 908.3%?-33.1%?13.1%?-5.6% and333.3%?146.5%?-68.7%?-49.8%. NH4+-N and SO42-ion in through fall are purified by the soil layer of camphor forest. In general, after atmospheric precipitation flowed through Bambusa chungii forest and camphor forest ecosystem, the content of nutrition element(N,P,K, NH4+-N,SO42-) of the former increase by 1933.3%?1982.9%?446.7%?63.3%,and the latter increase by 989.3%?1583.7%?-7.57%?-53.1%. During the research period,the average content of P element and SO42-ion of Reservoirwater is respectively56.9% ? 26.1% lower than atmospheric precipitation, but K element and NH4+-N is respectively 0.7%?0.9% higher than atmospheric precipitation. So when the atmospheric precipitation flow through Bambusa chungii forest ecosystem and camphor forest ecosystem are show differently purification efficiency of material flow. The relationship of different element of Bambusa chungii forest and camphor forest can be simulated by Linear regression model.After flowing through Bambusa chungii forest and camphor forest ecosystem and flow into reservoir,atmospheric precipitation had being obviously purified, but there is a seasonal fluctuation. Bambusa chungii forest and camphor forest make the PH of atmospheric precipitation from acid to neutral which fuctions is mainly in the canopy but is weak in the litter and soil layer. Bambusa chungii forest and camphor forest have differently effection in the BOD5 and CODcr value of Atmospheric precipitation in the different season. In general,consulting with national surface water quality standards, after flowing through Bambusa chungii forest and camphor forest ecosystem and flow into reservior, CODcr and BOD5 value of atmospheric precipitation may be respectivelychanged by the class ? to class I and of the class ? to class I water standards, but the purifying function effection varies by season. |
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