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南京农业大学草业学院:农业生态系统土壤有机碳响应和氮素输入空间格局受温度驱动

  • 2026-05-09 16:18:38
南京农业大学草业学院:农业生态系统土壤有机碳响应和氮素输入空间格局受温度驱动

文章标题Response of soil organic carbon and spatial patterns under nitrogen input are temperature-driven in agricultual ecosystems

发表期刊:《Agricultural and Forest Meteorology》

影响因子:5.7

第一单位:南京农业大学草业学院

在线时间:2026-04-24

在人类活动不断增强氮输入的背景下,土壤碳循环正在被深刻重塑。一项发表于 Agricultural and Forest Meteorology 的全球综合研究,基于2131个观测数据系统评估了氮输入对土壤有机碳(SOC)及其组分的影响机制与空间格局,揭示了一个重要事实:氮输入总体上可以促进土壤碳积累,但这种效应高度依赖生态系统类型和气候条件 。研究表明,氮输入平均可使SOC增加约6.4%,这一增长主要来源于活性碳组分(如颗粒有机碳POC增加12.5%、溶解性有机碳DOC增加4.4%)的显著提升,本质上是氮素通过促进植物生长与碳输入,带动土壤“快循环碳库”的积累。然而,这种“增碳效应”在不同生态系统中表现出明显差异:在农业生态系统中,SOC增幅更高(约9.6%),而在自然生态系统中增幅相对较小,反映出高强度施肥背景下农业系统对氮输入响应更敏感,但也更加不稳定。

进一步分析发现,控制这一过程的关键机制在不同生态系统中存在本质差异。在农业生态系统中,SOC对氮输入的响应主要由气候驱动,尤其是温度因素起决定作用,其中“最湿季度温度”被识别为最关键的控制因子。这意味着,在适宜的水热条件下,氮输入可以通过增强植物碳输入和微生物碳利用效率,促进土壤碳积累;但在高温或极端气候条件下,这种正效应可能被削弱甚至逆转。相比之下,在自然生态系统中,SOC变化则更多取决于氮输入强度本身,当氮输入超过一定阈值后,其促进碳积累的作用会逐渐减弱,甚至因养分失衡和土壤酸化而产生负效应。这种“阈值效应”表明,氮并非越多越好,而是存在最优范围。

从空间格局来看,氮输入对土壤碳的影响呈现出显著的区域差异。在未来气候情景下,大多数地区土壤碳仍呈增加趋势,但农业生态系统表现出更强的空间异质性,既有明显增碳区域,也存在碳减少的“风险区”,尤其在热带和高温区域,气候变化可能放大碳损失风险。相比之下,自然生态系统整体表现出更稳定的增碳趋势。这一结果说明,农业系统虽然增碳潜力大,但不确定性也更高,更容易受到气候变化和管理方式的影响

总体来看,这项研究传递出一个关键信息:氮输入既是提升土壤碳汇的重要手段,也是潜在的不稳定因素。未来农业与生态管理的核心,不应简单追求增加氮投入,而应在“气候条件—氮输入—土壤过程”之间寻求最优平衡。换句话说,真正决定土壤碳能否持续积累的,不只是施了多少氮,而是这些氮是否在合适的气候与管理条件下,被有效转化为稳定的土壤碳。

图1.基于生态系统类型、森林生物群、N输入形式、N投入率(g m−2年−1)和持续时间(Yr),N输入对SOC、微生物量碳、DOC、POC和MAOC浓度的影响。注:SOC,土壤有机碳;MBC,微生物生物量碳;DOC,溶解有机碳;POC,颗粒有机碳;MAOC,矿质有机碳。带有误差条的圆点表示总体平均值和95%的可信区间(CI)。每个子组的样本量显示在圆点旁边。灰色表示不显著的影响,蓝色表示正面影响,红色表示负面影响。

图2. 在(a,c)农业和(d,f)自然生态系统中,所有29个预测因子对土壤有机碳的lnRR的可变重要性。土壤有机碳的lnRR与农业的TWEQ(B)和自然生态系统的Nm(E)之间的关系(前一个变量)。注:MAT,年平均气温;TDR,平均日较差(月平均(最高气温-分钟气温));等温线,等温线((BIO2/BIO7)×100);季节,气温季节性(SD×100);TWM,最暖月最高气温;Tcm,最冷月最低气温;ATR,年气温极差(BIO5~BIO6);TWEQ,最湿季度平均气温;TDQ,最暖季度平均气温;TCQ,最冷季度平均气温;MAP,年平均降水量;PWM,最湿月降水;PDM,最干旱月降水;季节,降水季节性;PWEQ,最潮湿季度降水;PDQ,最干燥季度降水;PWQ,最温暖季度降水;PCQ,最冷季度降水;NPP,净第一性生产力;Abs.lat,绝对纬度;海拔;BD,土壤容重;CEC,阳离子交换量;pH,土壤pH;粘土-粉砂,土壤粘粒和粉土(质量百分比);ST,土壤温度;SM,土壤水分;以及Nm,N输入大小。

图3. 土壤有机碳各组分的响应率与(A)降水季节性(CV)、(B)温度季节性(SD×100)、(C)净初级生产力、(D)年平均降水量、(E)农业生态系统年较差(BIO5~BIO6)、(F)N值、(G)降水季节性(CV)、(H)海拔高度、(I)最湿季平均温度、(J)土壤粘粒和粉粒、(K)年平均温度、(L)土壤容重之间的关系。

图4.2021年至2060年四种气候情景下(a-d)农业生态系统和(e-h)自然生态系统中氮引起的有机碳浓度相对变化的空间分布和纬向分布线。

图5.2061年至2100年四种气候情景下(a-d)农业生态系统和(e-h)自然生态系统中氮引起的有机碳浓度相对变化的空间分布和纬向分布线。

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  1. CONNECT:[ UseTime:0.000385s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000794s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000306s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000280s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000572s ]
  6. SELECT * FROM `set` [ RunTime:0.000225s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000582s ]
  8. SELECT * FROM `article` WHERE `id` = 547698 LIMIT 1 [ RunTime:0.004355s ]
  9. UPDATE `article` SET `lasttime` = 1778832405 WHERE `id` = 547698 [ RunTime:0.011615s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.004801s ]
  11. SELECT * FROM `article` WHERE `id` < 547698 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001895s ]
  12. SELECT * FROM `article` WHERE `id` > 547698 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000747s ]
  13. SELECT * FROM `article` WHERE `id` < 547698 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.014104s ]
  14. SELECT * FROM `article` WHERE `id` < 547698 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001545s ]
  15. SELECT * FROM `article` WHERE `id` < 547698 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007395s ]
0.117251s