Evaluation of pollution-free Myrica rubra production in Zhejiang Province

Key words: 
• cash forest /
• Myrica rubra /
• pollution-free production /
• soil environmental quality /
• heavy metals /
• key measures

Abstract: Soil condition (pesticide residue and heavy metals concentration )and heavy metals concentration in Myrica rubra (China bayberry )fruits were analyzed by atomic absorption spectrophotometer PE-5000 and atomic fluorescence spectrophotometer AFS-1201 to understand the actual production of pollution-free Myrica rubra fruits . 35 soil samples collected in Cixi , Huangyan , Wenzhou , Yuyao , Linhai , Xianju , Wencheng and Shangyu of Zhejiang Province , and the fruit samples were collected Ninghai , Yueqing , Xiaoshan , Lanxi of Zhejiang Province except of the above plots , including two batches .Most sample spots were at the side of a town industry region and highways .The pollution index equals to determined value divided by limited value .Results showed that in the soil , pesticide residue was undetected with six heavy-metals (Cd , Pb , As , Cr , Hg , and Cu)being discovered in most production regions .Average content of the heavy-metal in the soil was ranked in the order of Pb Cr As Cu Cd Hg , while the pollution index was Cd Cr Pb As Hg Cu .The percentage of 97.14 %of the samples in the production regions met the pollution-free soil quality standard .However , in all of the fruit samples , Cd , As , and Cu were detected ;in most Pb was found ;and in two-thirds Hg was present .In the research , 94.12 % and 90.70 %of the two batch samples accorded with the national fruit standard .The maximum heavy-metal in the soil samples that was above the standards was Cd followed by Pb .Planting site avoided pollution , normative fertilization and pesticide applications were necessary in the production of pollution-free M .rubra fruits . [ Ch , 3 tab .8 ref .]