Soybean (Glycine max(L.) Merrill) intercropping with reduced nitrogen input influences rhizosphere phosphorus dynamics and phosphorus acquisition of sugarcane (Saccharum officinarum)
Soybean (Glycine max(L.) Merrill) intercropping with reduced nitrogen input influences rhizosphere phosphorus dynamics and phosphorus acquisition of sugarcane (Saccharum officinarum)
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减少氮输入的大豆 (Glycine max(L.) Merrill) 间作影响根际磷动态和甘蔗 (Saccharum officinarum) 的磷获取
DOI：
10.1007/s00374-020-01484-7
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发表时间：
2020
影响因子：
6.5
通讯作者：
Wang Jianwu
中科院分区：
文献类型：
--
作者：
Tian Jihui;Tang Mengtian;Xu Xia;Luo Shasha;Condron Leo M.;Lambers Hans;Cai Kunzheng;Wang Jianwu
减少氮素投入可以提高谷物-豆科间作的产量，但对磷素获取的影响尚不清楚。通过为期10年（2009-2018）的田间试验，定量研究了大豆（Glycine max(L.)）间作对甘蔗（Saccharum officinarum）获取磷的影响。美林在1:1和1:2)，两个N输入（300 kg ha - 1[减少]，525 kg ha - 1[常规]）。甘蔗-大豆套作的土地当量比显著高于单作，且在氮素投入减少的情况下，套作优势更为明显，这可能与氮素的高度互补利用有关。此外，减少施氮量的大豆间作刺激了甘蔗根际酸性磷酸单酯酶活性，减少了甘蔗根际有机磷，导致甘蔗茎磷浓度和系统磷利用效率增加。在减少氮素输入的条件下，大豆的共生固氮量、土壤微生物量和活性的增加可能与种间P获取的便利性有关。综上所述，减少甘蔗施氮量的大豆间作促进了根际酶促有机磷转化和甘蔗磷的获取，这可能有助于在低氮供应下维持甘蔗的可持续生产。这一发现促进了我们对氮磷循环相互作用的认识，并为谷豆间作在减少肥料投入方面的价值提供了新的证据。
Reducing nitrogen (N) input can improve crop productivity in cereal-legume intercrops, but the impact on phosphorus (P) acquisition is unclear. A 10-year (2009–2018) field experiment was conducted to quantify how P acquisition by sugarcane (Saccharum officinarum) was affected by intercropping with soybean (Glycine max(L.) Merrill at 1:1 and 1:2) with two N inputs (300 kg ha−1[reduced], 525 kg ha−1[conventional]). Nitrogen was supplied only to the sugarcane crop, and soybean received no N. There was a significantly higher land-equivalent ratio of sugarcane-soybean intercropping than of the sole cropping, and the intercropping advantage was more pronounced under reduced N input which can be associated with high degree of complementary N use. Furthermore, soybean intercropping with reduced N input stimulated acid phosphomonoesterase activity and depleted organic P in the rhizosphere of sugarcane, resulting in increased sugarcane stem P concentration and system P-use efficiency. The interspecific facilitation of P acquisition could be associated with the increased symbiotic N2fixation in soybean, soil microbial biomass and activity under reduced N input. In conclusion, soybean intercropping with reduced N input to sugarcane enhanced rhizosphere enzymatic organic P transformation and sugarcane P acquisition, which may contribute to maintaining a sustainable sugarcane production under low N supply. The findings advance our understanding of interactions between N and P cycling and provide new evidence for the value of cereal-legume intercrops in reducing fertilizer input.