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以红壤区25年生茶园为对象,开展pH 4.5、pH 3.5、pH 2.5及自来水(对照)4种强度模拟酸雨处理原位试验,于处理第3年收集茶树体不同功能根系和不同年龄枝、叶,测定氮(N)、磷(P)含量,并计算化学计量比和酸雨响应敏感度.结果表明:土壤pH值、硝态N和有效P随酸雨强度增加而显著降低.吸收根N含量随酸雨强度增加而提高,pH 2.5处理下吸收根N含量与对照相比显著提高32.9%;储藏根P含量随酸雨强度增强而显著降低;同时酸雨处理显著提高吸收根N/P.新叶和老叶N、P含量对不同强度酸雨处理响应不敏感,但酸雨处理增加了老叶N/P,且在pH 3.5处理下达到显著水平.酸雨处理对枝条的影响与其年龄有关,新枝N含量和N/P在低强度酸雨(pH 4.5)处理下显著增加,而老枝N含量和N/P对酸雨处理响应不敏感.吸收根、新叶和新枝N含量对酸雨响应敏感度分别高于储藏根、老叶和老枝,而储藏根和叶片P含量对酸雨响应敏感度高于其他器官.茶树器官N含量对酸雨处理较为敏感,适度酸雨可增加幼嫩器官N含量和N/P,改变茶树体N、P的循环和平衡.
Taking 25-year-old tea plantation in red soil area as object, four kinds of simulated acid rain treatments such as pH 4.5, pH 3.5, pH 2.5 and tap water (control) were conducted in situ to deal with the acid rain. , And the content of nitrogen (N) and phosphorus (P) were determined, and the stoichiometry and acid rain response sensitivity were calculated.The results showed that soil pH, nitrate N and effective P decreased significantly with the increase of acid rain intensity The acid rain intensity increased and increased, and the content of N in the root of absorption increased by 32.9% at pH 2.5. The content of P in storage roots decreased significantly with the increase of acid rain intensity, while the acid rain treatment significantly increased the N / Leaf N and P contents were not sensitive to acid rain treatments with different intensities, but the acid rain treatments increased the N / P of the older leaves and reached significant levels at pH 3.5. The effects of acid rain treatments on the shoots were related to their age, N content and N / P increased significantly under the low acid rain (pH 4.5), but the N content and N / P of the old branches were not sensitive to the acid rain treatment.The sensitivity of the absorption roots, the new leaves and the new branches N to acid rain were higher than that of the storage roots , Old leaves and old branches, while storing roots and leaves P In response to the amount of acid rain more sensitive than other organs. N content of tea plant organs more sensitive to acid rain, acid rain moderate increase young organs N content and N / P, N change tea body, circulation of P and the balance.