Abstract We report soil carbon stock (SCS) and nutrient characteristics of a pure stand of Senna siamea grove in comparison with adjacent cropland using t-test. This study was conducted in 2018 at the Kwame Nkrumah University of Science and Technology, Kumasi. Soil sampling up to 50 cm depth was carried out from five subplots in each ecosystem. The SCS of the grove at 0–15 cm depth was over 100% greater (30.78 Mg/ha) than that of the cropland (15.16 Mg/ha). Soil pH and total N content of the grove were 5.75 ± 1.22 and 0.10 ± 0.03% in the topsoil (0–15 cm) and 5.52 ± 0.80, 0.06 ± 0.01% and 5.03 ± 1.22, 0.04 ± 0.01% in the 15–30 and 30–50 cm depths, respectively. Although these values were greater in the grove than the cropland, the available phosphorus content was 3–4 fold greater in the latter soil. The two ecosystems affected soil organic carbon and total nitrogen contents significantly (p < 0.05) only in the topsoil, but had a significant influence on soil available phosphorus in both the topsoil and the subsoil. Sand content of the grove seemed to explain greater variability in its SCS (R 2 = 0.81) than clay content. The greater SCS of the Senna grove demonstrates its role in soil carbon storage in tropical climate in the era of climate change.

中文翻译：

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加纳半落叶林区番泻叶林土壤碳储量及养分特征

摘要 我们使用 t 检验报告了与邻近农田相比的纯番泻叶林的土壤碳储量 (SCS) 和养分特征。这项研究于 2018 年在库马西的夸梅恩克鲁玛科技大学进行。从每个生态系统的五个子样地中进行了深度达 50 厘米的土壤取样。0-15 厘米深度的树林的 SCS 比农田的 SCS（15.16 毫克/公顷）高 100% 以上（30.78 毫克/公顷）。树林的土壤 pH 值和总氮含量在表层土（0-15 厘米）中分别为 5.75±1.22 和 0.10±0.03%，在表土（0-15 厘米）中为 5.52±0.80、0.06±0.01% 和 5.03±1.22、0.04-0.03%，在 101%±0.01% 中和 30-50 厘米的深度，分别。尽管这些值在小树林中比农田大，但后者土壤中的有效磷含量是后者的 3-4 倍。这两个生态系统仅在表土中显着影响土壤有机碳和总氮含量（p < 0.05），但对表土和底土中的土壤有效磷有显着影响。与粘土含量相比，树林的砂含量似乎可以解释其 SCS (R 2 = 0.81) 的更大可变性。番泻叶林更大的 SCS 展示了其在气候变化时代热带气候土壤碳储存中的作用。